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How to tell a TPMS factory from a TPMS reseller Most companies you will find selling tyre-pressure sensors do not make them. Here are the four questions that separate the two — and our own answers, so you can check them the same way.
Send the four questions See the factoryWhy this matters more than the price list
A trading company buys a finished sensor and resells it. That is a legitimate business, and sometimes the right one to buy from. But it changes what you can ask for later: a change to the radio firmware, a marking convention, a different cell, a packaging variant — each of those has to be requested of somebody else, and comes back on their schedule if it comes back at all.
The practical test is not what a supplier says about its premises. It is whether it can answer technical questions in its own words.
The four questions
| 1. Ask why | Why this pressure range? What happens to accuracy at the cold end? A factory answers from design decisions. A reseller forwards the question or answers in datasheet language. |
|---|---|
| 2. Ask for the Bluetooth documentation | If you intend to build your own app, you need the service and characteristic definitions. A factory has them. A reseller usually cannot produce them, which means you would end up shipping their app. |
| 3. Ask who does the marking | Laser marking per batch is a production step. Ask what can be changed, and how long a change takes. The answer reveals whether marking happens in their building or somewhere upstream. |
| 4. Ask what happens when a batch is wrong | Traceability is a factory capability. Ask how a batch is traced back to production, and what the process is if a defect is found after shipment. |
Our answers, so you can check them. Sensing and firmware are ours; PCBA, assembly, calibration and laser marking are done here in Nanshan, Shenzhen. Pressure calibration is run on every unit, not by sampling. The Bluetooth behaviour is documented and we will share it under an agreement. Marking is editable per batch without new tooling.
What we actually build
Sensor platform
- BPU100 — BLE, 2.4 GHz (2400–2483.5 MHz), replaceable CR1632, for two-, three- and four-wheel vehicles.
- BPU110 — same platform, sealed cell.
- BPU120 / 130 / 140 — loader, wide-temperature and passenger-car variants of the same platform.
Where the reading goes
- A phone app — no receiver at all. This is the main reason our platform is cheaper to fit than a receiver-based system.
- A receiver — serial or CAN output, for your own controller.
- A display — built to order, for vehicles where a phone is not the right answer.
Applications run from motorcycles and e-bikes through ATVs, light four-wheel vehicles and passenger cars, up to trucks and light machinery. Our application pages cover each one, including where this platform is not the right answer.
The numbers a buyer should ask for
| Sensor capacity | 30,000 units a month. |
|---|---|
| Two-wheeler aftermarket supply | More than 10,000 sets a month into Chinese domestic programmes. |
| Test operations | Eight, listed in full on the quality page — including the four tests we do not run. |
| Legal entity | Shenzhen Guangzhan Electronics Co., Ltd. (深圳市光展电子有限公司) |
Ask about capacity, not about the headline figure. The useful question is not "what is your capacity" but "what is already committed, and where would my volume fit". A factory running close to full on domestic programmes cannot absorb a new export order quickly, whatever the monthly number says. We will tell you where we are.
What we will not claim
Three things, because buyers get burned on them.
- We do not describe our products as certified. CE and related approvals are in progress for the relevant markets, and we hold no certificate numbers to quote. Ask us for the current status in writing for your market — see the compliance page.
- We do not promise exclusivity in any category.
- We do not claim to be a stronger radio than a 433.92 MHz system. Our sensor works in the 2.4 GHz band, which means a shorter range and a phone or receiver as the reader. It is cheaper and simpler to fit; it is not a long-range fleet system, and for that we will point you at our industrial range instead.
If a supplier answers these three questions with adjectives rather than specifics, keep looking.
Want samples or a specification for your programme?
Tell us the vehicle, wheel count, where the data should go, and the label language for your market. We answer in writing.