Can several motors run together or separately? | The control arrangement matters [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 "multiple motor control" 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

• Multiple motors can share a controller, while independent rhythms require a different control arrangement.
• Mr. Okada distinguishes shared wiring, separate controllers, and motor compatibility.
• The plain vibrating chip remains listed; the older reinforced six-wire design was discontinued.

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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: multiple motor control

The OK Prostate Chip is a small device placed in the urethra (the urine passage) to act on the prostate. Vibrating versions contain motors, with cables leading to external controllers (units that set vibration strength or patterns). These entries describe several motors sharing control, separately controlled motors, and two controllers contributing rhythms to one motor. The examples include motors within the urethra and others intended for external areas such as the nipples.

Independent motor control required more wiring in the March 2019 reply

In an entry published in March 2019, a customer wanted a twin-motor chip to produce separate, changing vibration patterns. Mr. Okada thought 4 wires would be needed for the 2 motors to move differently.

The diary does not record whether that customer's proposed modification was completed. Mr. Okada cautioned that this independent arrangement would be harder to build.

(Source: ok-lab's diary, published March 2019)
https://ok-lab.hatenablog.com/entry/2019/03/02/151104

A USB splitter made simultaneous twin-motor operation available in December 2019

An entry published in December 2019 introduced a USB splitter (a cable dividing one controller's output between motors). The new cable started two vibrating chips together.

It used 3 USB terminals and cost ¥1,500 (about $10 at ¥156 = $1, rate as of 2026-09-04) excluding tax as published in December 2019. Mr. Okada suggested contrasting a 10mm motor with an 8mm motor for greater variation in sensation.

(Source: ok-lab's diary, published December 2019)
https://ok-lab.hatenablog.com/entry/2019/12/07/162608

Two controllers contributed different rhythms to one motor in February 2020

In an entry published in February 2020, a customer's request for an additional retrieval cable led to a dual-cable prototype. Mr. Okada reported that 2 controllers contributed their separate rhythms simultaneously to 1 motor, producing unpredictable vibration.

The directly wired 10mm test motor would not start at 1.5V. It also would not run with reversed polarity (the positive and negative connection direction). Mr. Okada preferred the version with two cables attached directly to the motor.

(Source: ok-lab's diary, published February 2020)
https://ok-lab.hatenablog.com/entry/2020/02/08/151653

Wireless multiple motor control exposed a serious compatibility limit in January 2022

In an entry published in January 2022, a customer asked to buy the wireless controller separately for existing vibrating chips. Mr. Okada changed his sales plan to make separate controller sales standard.

However, the German-made Bluetooth controller (a wireless control unit) worked only with his 8mm motors. The 10mm motors did not run. He reported that 6mm motors broke on connection and warned against that combination.

(Source: ok-lab's diary, published January 2022)
https://ok-lab.hatenablog.com/entry/2022/01/22/123342

Linked multiple motors had separate custom prices in May 2022

An entry published in May 2022 introduced motor chains joined by 4-wire support cables (cables linking and supporting motors). Mr. Okada had tested vibration outside the body only at that point.

A 4-wire plain vibrating unit with a cable of 5cm or less was priced at ¥4,000 (about $26 at ¥156 = $1, rate as of 2026-09-04) excluding tax. The 6-motor chain cost ¥23,000 (about $147 at ¥156 = $1, rate as of 2026-09-04) excluding tax, as published in May 2022. Mr. Okada cautioned that worn batteries might struggle with that many motors.

(Source: ok-lab's diary, published May 2022)
https://ok-lab.hatenablog.com/entry/2022/05/21/124217

Independent motor control aimed to give separate areas different vibration strengths

In an entry published in May 2022, Mr. Okada reported that his shared-control prototype lacked contrast between the prostate and penile-head areas. His next prototype assigned about 3V to one pair of motors and about 5V to another pair.

He had tested that new arrangement outside the body only when the entry was published. His proposed answer was separate controllers providing different rhythms and strengths for the two areas.

(Source: ok-lab's diary, published May 2022)
https://ok-lab.hatenablog.com/entry/2022/05/28/123218

The older independent motor control design was unavailable by August 2023

In an entry published in August 2023, a customer requested an earlier design with independently driven motor groups. Staff declined that design because its reinforced 6-wire cable had been discontinued over durability problems.

Mr. Okada then proposed separate thin-cable vibrating chips, each with its own controller, sharing the urethral space. The diary does not record whether this proposed order was completed. For this request, he suggested one 2-motor chip and one 1-motor chip.

(Source: ok-lab's diary, published August 2023)
https://ok-lab.hatenablog.com/entry/2023/08/19/123214

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The maker's answer to multiple motor control

Mr. Okada's answers depended on the motor, its power requirements, and whether control needed to be shared or separate.

Rechargeable power addressed a starting limit when using two controllers

An entry published in February 2020 records a customer requesting a plain vibrating chip with two controllers. Mr. Okada recommended two patterned controllers, and the customer accepted the rechargeable version of the quote.

The diary does not record whether it was delivered or how it felt in use. He reported that the new 10mm motor stopped at roughly 2.8V or below. Because disposable batteries would need frequent replacement, he recommended rechargeable controllers.

(Source: ok-lab's diary, published February 2020)
https://ok-lab.hatenablog.com/entry/2020/02/15/144151

External multiple motor control prompted a suggestion for less costly motors

In an entry published in December 2021, Mr. Okada reconsidered an outside developer's project involving motors intended for skin contact. He thought it did not need the prolonged waterproofing and boiling resistance expected of his urethral motors.

He said he did not plan to manufacture a cheaper motor product for that purpose. Instead, he advised the developer to consider inexpensive, commercially available motors for external vibration.

(Source: ok-lab's diary, published December 2021)
https://ok-lab.hatenablog.com/entry/2021/12/11/124426

Multiple motor control exposed slow responses despite successful simultaneous operation

In an entry published in April 2022, a customer tested an eight-channel box (a controller with eight separate motor outputs). They confirmed simultaneous operation of 8 motors of 10mm, but found their response slow and suspected 8mm motors would suit touch reproduction better.

Mr. Okada showed the newly prepared smaller chips; the diary does not record the completed comparison. He acknowledged that compatibility checks only established operation in some modes; full compatibility remained unconfirmed. For reproducing touch, he advised matching the control software and motor specifications.

(Source: ok-lab's diary, published April 2022)
https://ok-lab.hatenablog.com/entry/2022/04/02/123050

Higher voltage for multiple motors came with an explicit duration warning

A customer asked about multiple-motor designs after finding earlier vibrating chips insufficiently stimulating. In an entry published in June 2022, Mr. Okada replied that 4.5V or above produced much more vibration than 3V.

The diary does not record the outcome of that proposed purchase. He warned that prolonged 6V use was dangerous.

(Source: ok-lab's diary, published June 2022)
https://ok-lab.hatenablog.com/entry/2022/06/04/123036

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How multiple motor control changed over time

The diary does not say what the current state is.

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OK Prostate Chip products related to multiple motor control

The plain vibrating chip appears on the current product list at ¥3,300 (about $21 at ¥156 = $1, rate as of 2026-09-04) including tax.

Products that appear in these entries

The plain vibrating chip is listed in OK Lab's own online store.

(Source: ok-lab's diary, published November 2021)
https://ok-lab.hatenablog.com/entry/2021/11/20/125643

Products the diary mentioned as alternatives

The diary names no alternative.

Historical custom builds include twin-motor chips, splitter assemblies, combined-control designs, linked motor chains, thin-cable assemblies, and the April 2023 motor system. No matching product can be confirmed on the current list.

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Common worries about multiple motor control

The diary distinguishes motor count from the number of independently controllable outputs.

"Can a USB splitter run two vibrating chips together?"

In an entry published in November 2021, a customer wanted two plain vibrating chips for the nipples to respond to one output. Mr. Okada agreed and said staff would provide a quote.

He said repeated USB branching could theoretically connect any number of motors; he gave no tested maximum. The diary does not record whether this order was completed. His proposed solution was an additional USB splitter.

(Source: ok-lab's diary, published November 2021)
https://ok-lab.hatenablog.com/entry/2021/11/20/125643

"Does a two-wire cable allow independent motor control?"

In an entry published in December 2022, a customer asked which cable could support linked motors after reading about earlier custom designs. Mr. Okada explained that 2-wire cable had only 1 electrical circuit (a shared current path), allowing only 1 controller.

That arrangement provided simultaneous vibration, without independent motor control. The diary does not record whether the customer ordered that configuration. Mr. Okada advised that extra USB connections offered little benefit in this arrangement.

(Source: ok-lab's diary, published December 2022)
https://ok-lab.hatenablog.com/entry/2022/12/24/122944

"Will multiple motors on one controller make each motor weaker?"

In an entry published in January 2025, a customer worried that sharing a controller would weaken each motor's vibration. Mr. Okada expected almost no loss with 2 motors, and slight loss around 5 motors. He thought two controllers might help provide different vibration patterns.

He ultimately declined the customer's custom order, citing uncertain motor quality and his inability to meet the request confidently. The diary does not record a later purchase. He suggested evaluating motor performance with a simple catalog vibrating model.

(Source: ok-lab's diary, published January 2025)
https://ok-lab.hatenablog.com/entry/2025/01/25/122940

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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.