Can a sea-slug chip have vibration? | Version 4 loses its rear shape, the maker says [OK Prostate Chip]

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 "adding vibration to a sea-slug chip" 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.

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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

• Mr. Okada says a motor replaces the rear shape that distinguishes the version 4 sea-slug chip.
• He asks customers to reconsider before agreeing to a custom motorized version.
• The diary first recorded completed motorized version 4 examples in December 2023, without reports of their performance in use.

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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.

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Before you read: key terms

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What happens: adding vibration to a sea-slug chip

The OK Prostate Chip is a small device placed in the urethra, the urine passage, to act on the prostate. The sea-slug chip (Umiushi) is one of the custom shapes discussed in these entries, with several numbered versions. Its vibrating form has a motor at the rear, replacing the part that distinguishes version 4. Mr. Okada links that original rear shape to the chip's ability to stay in place.

A vibrating sea-slug chip request changed shape in October 2020

In an entry published in October 2020, a customer requested bumped version 4 sea-slug chips in both nonmotorized and vibrating forms. The vibrating order specified a 10 mm motor and an approximate length of 49+15 mm. Its medium-length ceramic vibrating model was listed at ¥6,600 (about $42 at ¥156 = $1, rate as of 2026-09-04) in that order.

After Mr. Okada's warning, the customer changed the vibrating request to the revised version 3 sea-slug chip, modification 1. The diary does not record how that revised chip felt in use. Mr. Okada advised against motorizing version 4 because the motor would occupy the area of its distinctive rear shape.

(Source: ok-lab's diary, published October 2020)
https://ok-lab.hatenablog.com/entry/2020/10/17/121023

An 8 mm motor did not change the sea-slug chip warning

In an entry published in April 2022, a customer requested the version 4 shape on a medium-length ceramic vibrating chip. This order specified an 8 mm motor and an approximate length of 41+15 mm. The customer accepted a change to version 3, modification 1, but the diary does not record their experience with it. Mr. Okada again warned that adding the motor would remove version 4's characteristic rear shape.

(Source: ok-lab's diary, published April 2022)
https://ok-lab.hatenablog.com/entry/2022/04/23/123121

The first vibrating version 4 sea-slug chips appeared in December 2023

In an entry published in December 2023, Mr. Okada reported making the first motorized version 4 sea-slug chips. 2 customers had accepted his warning and confirmed that they wanted their original requests fulfilled. He described proceeding with those builds, but the diary does not record either customer's experience afterward. His request was that customers acknowledge the change to the rear before confirming production.

(Source: ok-lab's diary, published December 2023)
https://ok-lab.hatenablog.com/entry/2023/12/16/121942

The original version 4 sea-slug chip deliberately emphasized rear corners

In an entry published in February 2024, Mr. Okada recalled the original customer's design request for the version 4 sea-slug chip. He remembered its defining feature as an angular ending, with pronounced corners rather than a smooth rear. He explained that a later request for a more sloping ending departed considerably from that original concept. For motorized requests, Mr. Okada continued to warn that the motor would remove this distinctive rear feature.

(Source: ok-lab's diary, published February 2024)
https://ok-lab.hatenablog.com/entry/2024/02/17/123013

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The maker's answer to adding vibration to a sea-slug chip

Mr. Okada asks customers to reconsider the shape and accept its limitations before commissioning a motorized version 4.

A vibrating sea-slug chip changes the feature Mr. Okada associated with stability

In December 2023, Mr. Okada explained that a motorized version 4 has its rear section replaced by a motor. He attributed the original version's strong ability to stay in place to that rear section's unusual shape. His concern was that the motorized build would lose the feature responsible for that behavior, in his view. He asked customers to confirm whether they still wanted production to proceed after receiving this explanation.

(Source: ok-lab's diary, published December 2023)
https://ok-lab.hatenablog.com/entry/2023/12/16/121942

Earlier vibrating sea-slug chip discussions usually ended with another shape

In the December 2023 entry, Mr. Okada described how customers had responded to his earlier warnings. He wrote that nearly all had switched to either the version 2 sea-slug chip or version 3, modification 1. His usual response had been to ask customers to reconsider version 4 because motorizing it would sacrifice its defining rear feature.

(Source: ok-lab's diary, published December 2023)
https://ok-lab.hatenablog.com/entry/2023/12/16/121942

A handmade vibrating sea-slug chip cannot exactly duplicate the published example

In December 2023, Mr. Okada explained that the newly pictured motorized version 4 chips were handmade. He cautioned that he could not make another exactly identical to an example. His guidance was to treat the published examples as references for future custom requests.

(Source: ok-lab's diary, published December 2023)
https://ok-lab.hatenablog.com/entry/2023/12/16/121942

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How adding vibration to a sea-slug chip changed over time

The diary does not say what the current state is.

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OK Prostate Chip products related to adding vibration to a sea-slug chip

The current list includes the ceramic vibrating model and bump option recorded in these custom requests.

Products that appear in these entries

The medium-length ceramic vibrating chip is sold through the company's own online store.

The raised-bump option is sold through the company's own online store.

(Source: ok-lab's diary, published October 2020)
https://ok-lab.hatenablog.com/entry/2020/10/17/121023

(Source: ok-lab's diary, published April 2022)
https://ok-lab.hatenablog.com/entry/2022/04/23/123121

Products the diary mentioned as alternatives

The diary names no alternative.

The custom sea-slug names discussed here include version 2, version 3 modification 1, version 4, and version 4 modification 1. No matching product can be confirmed on the current list.

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Common worries about adding vibration to a sea-slug chip

The requests also concerned existing controls, cable options, and rear shapes, with several outcomes left unreported.

"Can a vibrating sea-slug chip use an existing controller?"

In the October 2020 entry, the customer already owned a controller (the unit used to operate the motor) and requested no additional controller. They also requested a detachable cable connection and a cable length of 22 cm. The diary does not record whether those specific electrical requests were completed or how the existing controller worked with the finished chip. Mr. Okada's recorded advice concerned the rear shape, which he considered unsuitable for the requested motorized version.

(Source: ok-lab's diary, published October 2020)
https://ok-lab.hatenablog.com/entry/2020/10/17/121023

"Can a sea-slug chip have a cable without vibration?"

In an entry published in April 2022, a customer requested a nonmotorized version 4 chip with a four-line support cable (a custom cable option). They wanted this instead of nylon thread after preferring the cable on an earlier vibrating chip. Their request specified support along the full 35 cm cable length.

Mr. Okada said he supplied a supported section with ordinary cable making up the remainder. His reply explained that the four-line support section was limited to 25 cm.

(Source: ok-lab's diary, published April 2022)
https://ok-lab.hatenablog.com/entry/2022/04/23/123121

"Can a sea-slug chip have a less angular rear?"

An entry published in February 2024 describes a customer requesting a more sloping rear, hoping it would make removal easier. They wanted something resembling a photographed example, while leaving the final details to Mr. Okada. He made a less angular shape and named it version 4, modification 1.

Mr. Okada thought the customer's expectation might be right, but the diary does not record their experience with the completed chip. He said he wanted to learn how the altered rear affected the chip's ability to stay in place.

(Source: ok-lab's diary, published February 2024)
https://ok-lab.hatenablog.com/entry/2024/02/17/123013

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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 official sales-terms page (written here as plain text, not a link: ok-lab.net/docs/law), checked on September 7, 2026; confirm them on the official store before you order, because they can change.

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Summary of this article

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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.