![Is the cable too short? | Length depends on the cable design [OK Prostate Chip]](/img/a/T0224/eyecatch.svg)
This page is based on entries from "ok-lab's diary" (https://ok-lab.hatenablog.com/), the Japanese development diary written by Mr. Okada, founder of OK Lab, a small company in Japan (Okada Comfortable Life Laboratory). Only the entries about "extension cords and cable length" are summarized here, in order of publication. Past prices and sizes are as written at the time. Current prices come from the official product list (retrieved September 4, 2026). Quotations are translated from Japanese.
Note: This page is a personal reading log by someone with no connection to the maker or the seller. It reflects the source entries as of their publication dates and makes no guarantee of accuracy or safety. The product is not a medical device; talk to a doctor about any health decision. Check the official site for current information. This page contains advertising.
In short
Cable length varies by design; a longer attached lead was not always possible.
Mr. Okada proposed separate extension cords when the attached cable could not be longer.
The current product list includes USB connector fitting, but no separately listed extension cord.
About this product
The OK Prostate Chip is a small device that is placed in the urethra (the urine passage) so that it acts on the prostate; the maker sells it in several shapes, sizes and materials. It is made and sold by OK Lab (Okada Comfortable Life Laboratory), a small company in Japan, through its own online store, and prices are in Japanese yen (JPY).
The maker's development diary, "ok-lab's diary", is written in Japanese. This page is an English summary of it, and every quotation is translated.
OK Lab ships internationally, so readers outside Japan can order (see "Buying from outside Japan" below). Product names on this page are plain-English descriptions. The official Japanese product name is shown once in the product table so you can find the same item in the store.
Before you read: key terms
| Term | Plain-English meaning |
|---|---|
| Urethra | The urine passage; the base device sits inside it to act on the prostate. |
| Vibrating chip | A chip containing a small motor, intended to produce vibration. |
| Electrode chip | A chip with electrical contacts, intended to deliver electrical stimulation. |
| Controller | The external unit supplying a vibrating chip or electrode chip; a battery box supplies the motor. |
| Parallel cable | Two insulated wires running alongside each other, carrying electricity between the chip and its controller. |
| Miniature connector | A small detachable electrical joint, intended to separate a chip from its controller. |
| USB connector | A detachable plug or socket used here to join chip cables, extensions, and controllers. |
| Twin cable | Two parallel cables attached to one chip; Mr. Okada proposed them to improve reliability. |
| Nylon-reinforced cable | Thin electrical wires twisted with nylon thread, intended to combine flexibility with resistance to pulling. |
| Silicone-covered parallel cable | A parallel cable enclosed in silicone tubing, intended to change its firmness and surface feel. |
| Support cable | A cable construction intended to support the chip; older versions included four-wire and six-wire designs. |
What happens: short cables and extension cords
The OK Prostate Chip is a small device placed in the urethra to act on the prostate. Its vibrating versions contain a motor, while electrode versions have electrical contacts for stimulation. Their cables connect the chip inside the body to a controller or battery box outside it. The diary describes both the attached lead and separate extension cords, with different length limits depending on the cable construction.
A short cable left one customer struggling to position the battery box
In an entry published in February 2019, a customer reported that the vibrating chip's cable seemed too short to reach their waist. They wanted the battery box there while lying face down. Mr. Okada's reply discussed possible power-supply changes but gave no longer-cable specification. The diary does not record the outcome.
(Source: ok-lab's diary, published February 2019)
https://ok-lab.hatenablog.com/entry/2019/02/09/152257
A detachable connector made cable length an individual specification
An entry published in April 2019 introduced a miniature connector (a detachable electrical joint) for vibrating chips. Mr. Okada wanted the controller to be removable when its motor was unnecessary. His example placed the connector 25cm from the chip.
The proposed connector pair cost ¥4,000 (about $26 at ¥156 = $1, rate as of 2026-09-04) excluding tax, as published in April 2019. Mr. Okada asked customers to specify the chip-to-connector distance because individual anatomy differed.
(Source: ok-lab's diary, published April 2019)
https://ok-lab.hatenablog.com/entry/2019/04/06/151323
A longer battery box cable was part of one controller design
An entry published in June 2019 described approximately 75cm of chip-side cable and approximately 15cm on the battery-box side. The diary stated an overall cable length of 90cm for that construction. These measurements belonged to the simple battery-box controller described in that entry.
The controller was announced at ¥1,000 (about $6 at ¥156 = $1, rate as of 2026-09-04) excluding tax in June 2019, without ordinary batteries. Mr. Okada described the longer connection as allowing the battery box to fit in a pocket.
(Source: ok-lab's diary, published June 2019)
https://ok-lab.hatenablog.com/entry/2019/06/29/143536
A firmer cable length stopped where the ordinary lead began
In an entry published in October 2019, a customer requested a firmer cable. Mr. Okada offered a design combining a stiff section with the ordinary parallel cable (two insulated wires joined alongside each other). The customer chose 20cm of the firmer material, followed by the standard lead.
The diary shows the completed cable, but the customer’s assessment was still pending. Mr. Okada set future processing charges at ¥1,000 (about $6 at ¥156 = $1, rate as of 2026-09-04) excluding tax, explaining that joining the different wires took extra work. He proposed limiting the stiff section because it would be awkward to bend outside the body.
(Source: ok-lab's diary, published October 2019)
https://ok-lab.hatenablog.com/entry/2019/10/12/125944
A long cable performed differently with different test motors
In an entry published in July 2020, Mr. Okada tested a customer's unusually thin cable at approximately 200cm. He reported weak rotation with the newer 10mm motor, including after changing motors. An older 10mm motor worked, and a separate test with three 8mm motors also appeared to work.
Mr. Okada suspected the thin cable limited electrical supply and thought its length might contribute. He remained unsure about its strength. Because he expected wire breakage, he considered a paired cable necessary.
(Source: ok-lab's diary, published July 2020)
https://ok-lab.hatenablog.com/entry/2020/07/04/130440
Nylon reinforcement brought a fixed cable length and durability reservations
An entry published in August 2023 proposed nylon-reinforced cable (thin electrical wires twisted together with nylon thread). Its specified length was 30cm, ending at a USB connector (a detachable plug or socket), which the maker described as waterproof. The proposed cable package added ¥4,000 (about $26 at ¥156 = $1, rate as of 2026-09-04) excluding tax to the vibrating or electrode chip's price.
Mr. Okada thought the nylon improved resistance to pulling, but warned that electrical failure could occur sooner than with ordinary parallel cable. Long-term test results were unavailable. He planned further testing before accepting orders.
(Source: ok-lab's diary, published August 2023)
https://ok-lab.hatenablog.com/entry/2023/08/19/123214
Silicone covering limited cable length even when extra reach was wanted
An entry published in October 2023 introduced silicone-covered parallel cable (ordinary parallel cable enclosed in silicone tubing). The covered portion had a maximum length of 25cm, and the complete cable was limited to 40cm. Unless specified otherwise, it had a 25cm covered section followed by 15cm of ordinary cable.
The prototype used a short resin vibrating chip. The added processing price was ¥2,000 (about $13 at ¥156 = $1, rate as of 2026-09-04) excluding tax, and choosing a shorter cable did not reduce that price. Mr. Okada stated that longer versions could not be made.
(Source: ok-lab's diary, published October 2023)
https://ok-lab.hatenablog.com/entry/2023/10/14/122718
A reinforced vibrating design needed extension cords beyond its attached lead
An entry published in September 2024 described a vibrating design with two parallel cables partly bound together. Its cable length ran 35cm from the chip's rear end to the USB connector. The bound section could extend up to 20cm.
Mr. Okada presented this construction as an attempt to improve durability after reports of cable breakage. He stated that the earlier 70cm cable could not be made in this design. His answer for extra reach was a separate extension cord.
(Source: ok-lab's diary, published September 2024)
https://ok-lab.hatenablog.com/entry/2024/09/07/123204
The latest custom reply limited covered cable length for manufacturing reasons
In an entry published in June 2026, a customer requested the maximum cable length for a custom resin electrode chip. They specified a 25cm silicone-covered section and no terminal fitting. The quotation listed ¥1,100 (about $7 at ¥156 = $1, rate as of 2026-09-04) for cable work and ¥2,200 (about $14 at ¥156 = $1, rate as of 2026-09-04) for silicone covering.
The diary does not record the outcome. Mr. Okada limited that build's cable to 35cm because longer versions complicated production.
(Source: ok-lab's diary, published June 2026)
https://ok-lab.hatenablog.com/entry/2026/06/13/122909
The maker's answer to short cables and extension cords
Mr. Okada repeatedly proposed separate extensions when construction limited the cable attached to the chip.
A shorter twin cable could pair with an extension cord
An entry published in February 2020 introduced twin cable (two parallel cables connected to one chip). Mr. Okada said the standard 70cm length could be doubled throughout, but thought a shorter paired section would be easier to handle. The added cable cost ¥1,000 (about $6 at ¥156 = $1, rate as of 2026-09-04) excluding tax at that time.
A separate USB extension, with a plug and socket, also cost ¥1,000 (about $6 at ¥156 = $1, rate as of 2026-09-04) excluding tax in February 2020. Its length could be specified. Mr. Okada suggested approximately 30cm of twin cable followed by a single-cable extension.
(Source: ok-lab's diary, published February 2020)
https://ok-lab.hatenablog.com/entry/2020/02/15/144151
A linked electrode prototype required extension cords beyond its fixed lead
An entry published in January 2021 described a linked electrode prototype with a 30cm cable limit. Mr. Okada attributed that restriction to the difficulty of making the assembly. Its nylon thread length was also fixed at 30cm.
The prototype combined metal ring sections with an auxiliary chip. Mr. Okada directed customers wanting more reach to commercially available extension cords.
(Source: ok-lab's diary, published January 2021)
https://ok-lab.hatenablog.com/entry/2021/01/02/123619
Extra cable length on the controller offered another solution
An entry published in June 2022 replaced ordinary four-wire support cables (leads intended to support the chip) with six-wire versions. The ordinary two-wire section following the supported portion was limited to 20cm.
Mr. Okada said longer reach would require an extension and that OK Lab did not sell plug-type extensions then. However, he offered longer controller-side cable for USB connections without an additional charge. He also asked customers reconsidering these designs to account for the newly announced cable options.
(Source: ok-lab's diary, published June 2022)
https://ok-lab.hatenablog.com/entry/2022/06/11/123420
How short cables and extension cords changed over time
| Published | What the diary said then |
|---|---|
| Apr 2019 | Electrode connections offered 20cm, 25cm, or 30cm cables. |
| Nov 2019 | USB extension parts appeared; Mr. Okada preferred USB connections over miniature plugs. |
| Apr 2022 | Four-wire support cable became a paid option, ending its free trial period. |
| Apr 2022 | A connector design with separate pins allowed up to 20cm of trailing cable. |
| Jun 2022 | Ordinary four-wire sales ended; six-wire and thicker six-wire versions replaced them. |
| Apr 2023 | A 2m USB extension was announced at ¥1,000 (about $6 at ¥156 = $1, rate as of 2026-09-04) excluding tax. |
| Oct 2023 | Four-wire and six-wire support designs had been withdrawn over durability problems. |
| May 2024 | Stainless electrode cable was described as limited to 25cm. |
| Aug 2024 | A linked aluminum-electrode design limited cable length to 35cm. |
| Jul 2026 | A new adjustable cable assembly could attract length-dependent charges; extremely short versions might be impossible. |
OK Prostate Chip products related to short cables and extension cords
The current list includes a vibrating base chip and connection options, without a separately listed extension cord.
Products that appear in these entries
| Product (official name) | Price incl. tax | Relation to this topic |
|---|---|---|
| Short resin vibrating chip (OKプロステート核振チップ 樹脂素材ショートタイプ) | ¥4,400 (about $28 at ¥156 = $1, rate as of 2026-09-04) | An October 2023 quotation named this base chip separately from its custom silicone-covered cable and USB work. |
| Electronic controller upgrade (ICコントローラに変更（核振チップオプション）) | ¥2,200 (about $14 at ¥156 = $1, rate as of 2026-09-04) | In November 2019, a customer requested this controller with detachable connections for switching controllers. |
| Simple battery-box controller upgrade (ローテクコントローラに変更（核振チップオプション）) | ¥1,100 (about $7 at ¥156 = $1, rate as of 2026-09-04) | The November 2019 customer also requested this controller for the same detachable arrangement. |
(Source: ok-lab's diary, published October 2023)
https://ok-lab.hatenablog.com/entry/2023/10/21/123054
(Source: ok-lab's diary, published November 2019)
https://ok-lab.hatenablog.com/entry/2019/11/23/162919
Products the diary mentioned as alternatives
| Product (official name) | Price incl. tax | Relation to this topic |
|---|---|---|
| USB connector fitting (USB端子付け加工（核振チップオプション）) | ¥550 (about $4 at ¥156 = $1, rate as of 2026-09-04) | Mr. Okada preferred USB connections over miniature plugs in November 2019; the April 2022 short-cable order names this option. |
USB connector fitting is available through OK Lab's own online store.
(Source: ok-lab's diary, published November 2019)
https://ok-lab.hatenablog.com/entry/2019/11/30/164020
(Source: ok-lab's diary, published April 2022)
https://ok-lab.hatenablog.com/entry/2022/04/23/123121
No longer sold: four-wire and six-wire support cables, as reported in October 2023.
Custom cable assemblies, historical extensions, and linked electrode prototypes:
No matching product can be confirmed on the current list.
Common worries about short cables and extension cords
The replies address default length, detachable connections, and the extra reach needed for an existing controller.
"Can cable length be split between interchangeable controllers?"
In an entry published in November 2019, a customer wanted electronic and simple battery-box controllers to be interchangeable. Mr. Okada quoted ¥3,300 (about $21 at ¥156 = $1, rate as of 2026-09-04) for detachable connections on the chip and both controllers. The customer selected a connection point 10cm from the controller within the approximately 70cm lead.
The diary does not record the outcome. Mr. Okada's guidance was to specify the connection position when requesting this custom work.
(Source: ok-lab's diary, published November 2019)
https://ok-lab.hatenablog.com/entry/2019/11/23/162919
"What cable length was supplied without a special request?"
In an entry published in April 2020, a customer asked about cable length for a custom resin electrode chip. Mr. Okada gave 70cm as the default and noted that some customers requested 50cm when using their own extensions. This customer chose the default because they had no extension.
The diary does not record the outcome. Mr. Okada also explained that the customer needed to supply the separate electrical stimulation unit.
(Source: ok-lab's diary, published April 2020)
https://ok-lab.hatenablog.com/entry/2020/04/04/152310
"Will a short cable reach an existing controller?"
In an entry published in April 2022, a customer ordered a custom vibrating chip without a new controller. Mr. Okada explained that its four-wire construction allowed only 35cm to the USB connector. He thought that would be awkward with the customer's existing controller.
The customer added a ¥1,100 (about $7 at ¥156 = $1, rate as of 2026-09-04) USB extension to the order, but the diary does not record the outcome. Mr. Okada recommended the extension to address that particular lack of reach.
(Source: ok-lab's diary, published April 2022)
https://ok-lab.hatenablog.com/entry/2022/04/23/123121
Buying from outside Japan
OK Lab ships internationally to countries covered by Japan Post's EMS courier service. Overseas orders are paid in advance by PayPal. Each order carries a ¥400 (about $3 at ¥156 = $1, rate as of 2026-09-04) handling fee, and EMS shipping is charged on top. These terms come from OK Lab's (ok-lab.net/docs/law), checked on September 7, 2026; confirm them on the official store before you order, because they can change.
Summary of this article
| What you wanted to know | The answer |
|---|---|
| In short: is there one cable length? | No; specifications depend on the construction. |
| About the product: who makes it? | OK Lab in Japan makes the urethral device and its vibrating variants. |
| Key terms: what is being measured? | An attached lead, a supported section, or a separate extension. |
| What happens: why can reach be limited? | The diary describes both handling difficulties and manufacturing limits. |
| The maker's answer: what was offered? | Separate extensions and longer controller-side cable for USB connections. |
| Changes over time: do old specifications still apply? | Several designs changed, and older support cables were withdrawn. |
| Related products: what is listed today? | A short resin vibrating chip, controller upgrades, and USB connector fitting. |
| Common worries: what needed specifying? | Cable length, connection position, and whether an existing controller needed extra reach. |
| Buying abroad: what are the stated terms? | Advance PayPal payment, a ¥400 (about $3 at ¥156 = $1, rate as of 2026-09-04) handling fee, and additional EMS shipping. |
Source: ok-lab's diary (Okada Comfortable Life Laboratory). The original entries are in Japanese; quotations on this page are translated. Photos and videos are on the original entries.
This article is a summary of the maker's development diary. The product is not a medical device and no result is guaranteed. If anything feels wrong or worries you, see a doctor. Prices, specifications and cautions change, so confirm the latest information on the official blog and the official site. Questions about ordering and shipping go to the seller.