Electronics manufacturers in China: who builds it, and who can sell it
A consumer electronics product asks two questions of a supplier, and two different parties answer them. The first is whether the factory can build the thing to your specification, at your volume, repeatably. The second is whether you can lawfully sell it where you sell. A factory can be genuine and fail the second question, because certification belongs to whoever paid for it, for the product they submitted. That distinction gives this page its shape: how the electronics supply chain here is arranged, and the mistakes that cost buyers money.
Design house, assembler, own-brand manufacturer
Almost every consumer electronics product is developed by one company, assembled by another, and sold under the name of a third. The Chinese term for the first is 方案商, a solution provider. It develops the circuit, chooses the components, writes the firmware, and often holds the tooling, while owning no production line.
The second is the assembler. It receives a design or a kit, buys the modules, and puts the product together. Many assembly houses in Shenzhen and Dongguan work this way, and their websites do not say so.
The third is the own-brand manufacturer, which does both and sells under its own name. It is the rarest of the three and the most often claimed.
Which of them you have decides what you are buying. From a design house you are buying development, and production will happen somewhere you have not seen. From an assembler you are buying labour and process control, while the design and the choice of critical parts sit elsewhere.
The critical parts are usually bought in. The power supply, the battery pack, the PCBA and the radio module arrive as finished modules. The product can be assembled in the building you visit while its most consequential component, the one that decides whether it passes electromagnetic testing abroad, was chosen by a company the assembler will not name.
What a visit to an electronics factory establishes
We begin with the legal entity. The business licence shown on site is compared with the public register: registered name, unified social credit code, address and business scope. The entity you would pay should be the one operating there.
Then the floor. Whether there are surface-mount lines, whether they are running and what is loaded on them. Whether assembly benches are staffed, and whether test and ageing racks are in use. What the warehouse holds, with component labels legible in the photographs.
Then the part that matters most here. We ask to see your product and follow it backwards: which operations happen in the building and which arrive already done, whether the PCBA is bought populated, where the radio module comes from, and whether the factory will name the supplier.
On certification we look and record, nothing more. We ask which certificates exist for the product or its modules, in whose name they are held, and for which exact model and configuration. We do not test, we do not certify, and we issue no pass or fail verdict. We do look at the product and the operation, and we describe what we saw — the build, the finish, the scale of the site — as objective observations. The verdict is yours.
The traps specific to electronics
The borrowed certificate. A supplier sends a CE or FCC document that is genuine and belongs to someone else. It proves the module or the earlier product was tested, not the product you are buying. The holder's name, the brand, the model number and the configuration settle this.
The configuration that moved. Certificates describe a product as submitted. Change the power supply, the battery, the radio module or the enclosure, and the document may no longer describe what you are buying.
Market access is not one document. Europe turns on CE marking, plus RoHS for restricted substances, and the UK has UKCA. The United States turns on FCC for anything with a radio and, depending on the product, UL or ETL listing from a testing laboratory. These come from accredited laboratories, not from factories and certainly not from us. A factory can be excellent and still unable to give you the paperwork your market wants.
The middle link presented as the top. Brand owner, design house, module supplier, assembler, enclosure and packaging: five parties, and most buyers are talking to the third while believing they are talking to the first. The margin is real and the responsibility is thin.
The tooling that is not theirs. The mould may belong to the design house or to a previous client. If you scale, it may not follow you.
None of this means bad faith. The arrangement is invisible until you stand in the building and ask who made what.
Where these factories are, and what travel costs
Consumer electronics in southern China sits in two clusters. Shenzhen, with Dongguan immediately to its north, holds the region's largest concentration of electronics assembly, module makers and enclosure work. Both are inside the 150 km radius that our US$300 per factory fee already covers, so no travel supplement applies to either. The two places most likely to hold your supplier cost nothing extra to reach from our base in Panyu, Guangzhou.
Elsewhere the usual supplements apply. Huizhou and Jiangmen carry US$100; Yangjiang, Shaoguan and Chaoshan — Shantou, Chaozhou and Jieyang — carry US$200. Anywhere else in China is quoted separately.
A verification in the core area is delivered in one to two working days, and a remote site adds roughly a day. Factory finding takes three to five working days.
One planning note: design houses sit in office towers, not industrial parks, and in Shenzhen they cluster in Futian and Nanshan, so the work is split across two buildings, and possibly two cities.
Where the fee applies. Everything within 150 km of our Guangzhou base is included: Guangzhou, Foshan, Dongguan, Shenzhen, Zhongshan and Zhuhai. Beyond that we add a travel supplement, agreed in writing before we set off — Huizhou and Jiangmen +US$100; Yangjiang, Shaoguan and Chaoshan (Shantou, Chaozhou, Jieyang) +US$200. Anywhere else in China is quoted separately. This visit is inside that radius.
The only engagement published on this site so far is a furniture importer in Saudi Arabia, shown unedited with faces and supplier identities redacted. It involved seating, not electronics; we show it because it is the form of what you receive — the reference, the sample, the premises and the written report in one folder. With a supplier in mind, send the name and address on WhatsApp at +86 189 2212 3034 or by email to hello@factoryfinding.com, and we will visit and report for US$300 per factory, one-time, agreed in writing before we travel. Without one, send the brief and we will search for US$1,000. We take no commission, and the fee is identical whichever factory you choose.
Electronics manufacturers in China — common questions
My supplier's address is an office tower in Shenzhen. Does that mean they are not a factory?
Not necessarily. Plenty of legitimate electronics companies run sales and engineering from Futian or Nanshan while production sits elsewhere. A visit establishes what that office operates as and where the manufacturing happens.
The factory sent me a CE certificate. How do I know it covers my product?
Read four things on it: the holder's name, the brand, the model number, and the configuration described. If the holder is a module maker or a design house, or the model is not yours, it does not cover your product. We record which certificates exist and in whose name; the assessment is yours.
How do I know whether the critical module is made in-house or bought in?
Ask on site and follow it. The power supply, battery pack, PCBA and radio module are usually bought as finished modules, and the assembler may decline to name the maker. We record either the supplier's name or the fact that it was withheld.
How do I tell a design house from a factory before I travel?
Usually you cannot. Both call themselves manufacturers and both show samples. The difference appears when you ask what is done in this building. A design house develops the product and places the order elsewhere; an assembler builds it.