Why does the motor get hot or stop working? | Heat tolerance and reliability vary [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 motor heat resistance, water resistance, defects, and differences between units 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

• The diary records overheating, intermittent stopping, and differences between individual motors.
• Mr. Okada describes stronger construction, early-fault replacement, and warnings against higher voltages.
• The glass semi-long vibrating chip remains listed, while later entries still describe uneven motor reliability.

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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: motor overheating and stopping

The OK Prostate Chip is a small device placed in the urethra, the urine passage, to act on the prostate. In the vibrating versions, a motor produces vibration from within the chip, with a cable connecting it to an external controller. The diary discusses protection around that motor and its electrical connections because the vibrating chip is intended for an internal, wet environment. Its accounts cover heat exposure, unexpected stopping, and differences between individual components.

Motor failure concerns began with fragile connections and replacement costs

In an entry published in January 2019, Mr. Okada traced 2 test failures to unstable connections between wires and motors. He reported that some factory connections detached with barely any contact.

He said fixing a connection inside resin could not overcome an attachment that was already unreliable. He advised considering a purchase only with an expectation of regular ¥3,000 (about $19 at ¥156 = $1, rate as of 2026-09-04) replacements, as published in January 2019.

(Source: ok-lab's diary, published January 2019)
https://ok-lab.hatenablog.com/entry/20190105/1546673405

Motor overheating tests led Mr. Okada to warn against prolonged 6V use

In an entry published in June 2019, Mr. Okada reported a 6V test reaching about 65°C after approximately 5 minutes in air. According to his account, the temperature did not rise further during 10 hours of continuous running.

He speculated that the vibration exceeded what the brain could process and might cause emotional instability. His conclusion was that prolonged 6V use could be dangerous.

(Source: ok-lab's diary, published June 2019)
https://ok-lab.hatenablog.com/entry/2019/06/29/143536

A customer's 9V test prompted an explicit motor overheating warning

In an entry published in August 2019, a customer described a custom three-motor chip ordered for stronger vibration. The customer found little change from the earlier shape, then tested a 9V controller. Continuous vibration reportedly made the chip feel hot enough to burn.

The customer reported no peeling or motor failure after about 5 hours at maximum 9V. Mr. Okada suspected heat injury to the urethra, although the entry records no medical assessment. He explicitly warned against 9V operation.

(Source: ok-lab's diary, published August 2019)
https://ok-lab.hatenablog.com/entry/2019/08/10/125102

Another motor failure report brought a warning about supplies above 5V

In an entry published in November 2021, a customer's glass semi-long vibrating chip stopped after operation at 3V–6V. The customer then asked about ordering a custom three-motor model. Mr. Okada said he did not know why the original motor had failed.

He planned to discuss the new request the following week; this entry does not record a completed order. He said all the motors produced substantial heat above 5V. He warned about overheating and cited earlier reports of failures at 6V or higher.

(Source: ok-lab's diary, published November 2021)
https://ok-lab.hatenablog.com/entry/2021/11/13/123751

An 8mm motor variation arrived thicker and reportedly stronger

In an entry published in March 2022, Mr. Okada described receiving different motors despite ordering the previous specification. The new 8mm component was about 0.6mm thicker, and he reported stronger vibration.

He still had the older motors in stock and said those remained the default at that time. For buyers wanting the stronger version, he advised specifying that preference when ordering.

(Source: ok-lab's diary, published March 2022)
https://ok-lab.hatenablog.com/entry/2022/03/05/123200

Motor stopping returned after a period with few reported faults

An October 2024 entry reported about 4 initial faults over roughly 6 months, including 2 involving motors' stopping positions. One customer wanted help after vibration stopped despite battery changes. The returned product worked during brief checks, stopped overnight, and later ran again without an identified cause.

OK Lab sent a new unit and kept the returned product intact for investigation. Mr. Okada could not reproduce the stoppage during subsequent checks. For this customer's fault, OK Lab's initial advice had been to return the product for examination.

(Source: ok-lab's diary, published October 2024)
https://ok-lab.hatenablog.com/entry/2024/10/05/122923

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The maker's answer to motor overheating and stopping

Mr. Okada described stronger construction, examination of returned products, and limits on heat exposure and replacement coverage.

Motor reliability work shifted toward reinforcement before final chip assembly

In an entry published in January 2019, Mr. Okada acknowledged responsibility for preparing ordinary motors for the chip's intended environment. He noted their original roles as parts for phones and robots.

He began reinforcing each motor with resin (protective material around the component) and testing it before chip assembly. He advised buyers that the revised process required approximately 2 weeks of production time.

(Source: ok-lab's diary, published January 2019)
https://ok-lab.hatenablog.com/entry/20190112/1547275441

Water resistance claims did not extend to washing the controller

In an entry published in March 2019, a customer asked whether the vibrating chip could withstand cleaning used for non-vibrating chips. Mr. Okada's reply distinguished the chip and cable from the controller, mentioning an approximately 30-second heat-exposure limit.

He warned that heated cookware could damage the cable and that steam could affect the controller. He described his answer as experience-based and advised against washing or boiling the controller.

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

Motor heat resistance specifications described one newly tested component

In an entry published in February 2020, Mr. Okada supplied specifications for a new motor. Its operating temperature range (stated working limits) was -40 to 125 °C; its storage temperature range (limits while stored) was -65 to 150 °C.

He also described a water-bottle test assessing resistance to water and repeated knocks. He recommended the new motor based on its specifications and his testing.

(Source: ok-lab's diary, published February 2020)
https://ok-lab.hatenablog.com/entry/2020/02/22/145216

Reversed controller wiring could explain why the new motor would not start

An entry published in February 2020 identified potentially reversed wiring in previously shipped controllers with USB connectors (plugs joining chip cables and controllers). The older motors had operated regardless of the electrical connection's direction, masking the problem.

The new motor exposed the mismatch because it did not operate with the reversed connection. Mr. Okada offered to correct affected connector wiring after its return.

(Source: ok-lab's diary, published February 2020)
https://ok-lab.hatenablog.com/entry/2020/02/22/145216

Water-resistant motors with exposed metal were ruled out for sale

An entry published in February 2020 described Mr. Okada's test of a partly covered motor. He reported nausea and headaches beginning after about 5 days, with symptoms worsening afterward.

He suspected harm from the exposed metal, but did not establish the cause. He therefore ruled out selling vibrating chips with exposed motor metal.

(Source: ok-lab's diary, published February 2020)
https://ok-lab.hatenablog.com/entry/2020/02/22/145216

Early motor failure qualified for replacement under March 2020 terms

In an entry published in March 2020, a customer sought help for vibration that stopped after about 2 minutes but returned the following day. Mr. Okada accepted the report as an initial fault, although he could not identify its cause.

He described previously encountered problems as unreliable cable connections and motors unable to restart from certain stopping positions. His stated remedy was motor replacement for initial faults arising within approximately 2 weeks of delivery.

(Source: ok-lab's diary, published March 2020)
https://ok-lab.hatenablog.com/entry/2020/03/21/143802

By May 2022, motor failure replacement had a shorter initial window

In an entry published in May 2022, a customer asked about vibration disappearing during controller mode changes. Mr. Okada said intermittent faults could escape checks before shipping.

He explained that replacing an embedded motor involved substantial work, even when the component itself was inexpensive. He offered initial-fault replacement within about 1 week of purchase, while stating that later failures would incur the regular replacement charge.

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

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How motor overheating and stopping changed over time

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OK Prostate Chip products related to motor overheating and stopping

The glass semi-long vibrating chip appears in a failure report and remains on the supplied current product list.

Products that appear in these entries

The glass semi-long 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/2021/11/13/123751

Products the diary mentioned as alternatives

The diary names no alternative.

Custom three-motor builds: No matching product can be confirmed on the current list.

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Common worries about motor overheating and stopping

Customer questions concerned failures, heat tolerance, controller symptoms, and whether motor size could predict vibration strength.

"Does motor failure after 6V use qualify for replacement?"

In an entry published in August 2019, a customer sought repair for a stopped 8mm glass semi-long vibrating chip. The customer also wanted a thinner cable. Mr. Okada said cable replacement was possible, but expected it to require replacing the motor too.

He classified 6V operation as outside the rated voltage (normal specified supply level), and did not promise coverage for such failures. The diary does not record whether the repair was completed. He nevertheless offered replacement for an initial motor defect.

(Source: ok-lab's diary, published August 2019)
https://ok-lab.hatenablog.com/entry/2019/08/24/125858

"Are 8mm and 10mm motors equally heat resistant?"

In an entry published in September 2021, Mr. Okada recalled a caller asking about heat treatment of vibrating chips. He said 10mm motors kept running at 100°C, whereas 8mm motors stopped around 80°C and restarted after cooling. The diary does not record what the caller did after receiving this answer.

(Source: ok-lab's diary, published September 2021)
https://ok-lab.hatenablog.com/entry/2021/09/25/125720

"Does a lit controller rule out motor failure?"

In an entry published in April 2022, a customer reported a lit controller but no vibration, although another power source worked. Staff initially explained that starting power requirements differed between motors. The customer then reported continued stopping even at maximum output, especially during patterns containing pauses.

Mr. Okada consequently suspected the motor, rather than assuming the controller was responsible. The diary does not record the final diagnosis. He requested a return so OK Lab could identify which part was faulty.

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

"Can motor size guarantee predictable vibration strength?"

In an entry published in January 2025, a customer wanted predictable vibration from a small custom chip. Staff could not confirm motor speeds, and Mr. Okada said his strength comparisons were subjective. He reported considerable differences in motor durability and running noise.

After answering the questions, he declined the custom order because he lacked confidence in meeting the customer's expectations. He instead suggested a simple standard vibrating product in the ¥3,000 (about $19 at ¥156 = $1, rate as of 2026-09-04) class as a way to assess performance.

(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.