Buyers treat a smart switch order as a choice between products. In practice the first week of the conversation fixes three things that are cheap to specify and expensive to revise, and by the time a sample is in your hand most of the real cost of the order has already been committed. This is not vendor gamesmanship. It is what happens when a mechanical part, a radio and a compliance file all have to be settled before anything can be built.
The gang count is a tooling decision, not a product option
A one-gang and a four-gang switch look like variations on the same item. Inside they are different products. The faceplate is different, the relay layout is different, the PCB is different, and in most programmes the tooling is different.
That matters because gang count is usually chosen from a catalogue rather than from the installation. A buyer picks four-gang because the best-selling retail listing is four-gang, then discovers that the project it was meant for is mostly one-gang and two-gang plates at the doorways and a four-gang only in the kitchen. Mixing gang counts across one order is normal, but each distinct count behaves like its own line item when it comes to tooling and minimum quantity.
The right way to choose is from the wall, not from the catalogue. Walk the units you are fitting, count what actually goes where, and order the distribution you find. A project that is seventy percent two-gang should not be quoted as a four-gang programme with a few small plates thrown in, because the pricing will be built around the wrong item.
Plate standard is geography, and it cannot be retrofitted
The plate is the part the customer sees and the part that has to fit a hole in a wall that already exists. Standard sizes are regional, and they are not interchangeable. An 86 mm square plate suits much of Asia and parts of Europe, a 120 mm plate suits North America, and round and square back boxes within Europe do not accept the same plate either.
This is the decision that most often gets made by accident. A buyer sources against a photograph, approves a plate that looks right, and only at installation discovers that the wall boxes on site are a different standard. There is no adapter that makes this go away cleanly, because the plate has to sit flush against the wall and carry the touch surface. The options at that point are re-order or re-plaster, and both are worse than getting it right in week one.
If you are supplying more than one market, say so at the start. Plate standard is one of the few things that genuinely has to be split into separate production runs, and knowing that early changes how the order is quoted.
Wi-Fi or ZigBee is the third decision, and it changes what you certify
The protocol choice looks like a feature question and behaves like a supply chain one. A Wi-Fi switch carries its own radio and holds its own session with the router, which means the RF module is the single most important line in the bill of materials and the thing that sets the scope of radio certification. A ZigBee switch hands the network session to a hub, which changes the module, changes the firmware, and changes which parts of the compliance file are yours to hold.
Both are mature and both are defensible. Wi-Fi suits installations where every plate has decent signal and the buyer does not want to support a hub. ZigBee suits larger installs where local mesh resilience is worth maintaining a hub for. What is not defensible is deciding late. The radio is a long-lead component and the firmware is written around it, so a protocol change after the firmware is settled is close to a restart.
Ask which module is used and how long the vendor commits to firmware for it. That answer tells you more about whether the product will still be supportable in three years than any line about relay ratings.
What actually moves the unit price
The radio is the headline cost, but the price moves on a cluster of smaller decisions that buyers rarely price out separately. Relay rating, whether the panel is glass or polycarbonate, whether the touch surface is capacitive or mechanical, whether a neutral is required at the box, and whether there is a backlight that has to stay lit without buzzing all interact with the module cost.
Tooling amortisation sits underneath all of it. A custom plate or a non-standard gang count carries tooling, and tooling is recovered across units, so the unit price depends on quantity more than buyers expect. Two quotes that look different per unit may be identical in total once one of them includes tooling the other has waived.
The sample is not the product
A sample confirms that a design exists. It does not confirm that the production run will match it. The useful questions are about substitution and firmware version rather than about finish.
Ask what happens if a specified component goes out of stock. Every factory has a substitution policy, and the honest answer is that approved alternates exist for most parts. What you want to know is whether you will be told before the swap, and whether the alternate changes anything you have certified.
Ask which firmware build is on the sample and which build ships. A sample running a newer firmware than the production image is a common and usually harmless situation, but it is the kind of gap that turns into a support problem when a feature the buyer approved on the sample behaves differently in the field.
What to ask before you commit
Get the module identified and the firmware commitment stated in writing. These two decide the supportable life of the product.
Get the plate standard and gang distribution confirmed against the actual installation, not against a listing. These decide whether the order can be installed at all.
Get the certification scope clear, including who holds the certificate and which markets it covers. A certificate held by the factory rather than by you is normal for OEM work, but you should know which it is before you build a retail listing on it.
Get the MOQ and tooling terms separated on the quote so you can see what the unit price is actually made of.
For switch programmes where the plate, gang count and radio are settled together rather than picked from a catalogue, the Tuya smart switch OEM route is the one that starts from the installation. Wall switch programmes specified at volume are covered under Wi-Fi smart wall switch OEM and wholesale, and where a hub-based design fits the installation better, ZigBee smart switch options move the network session off the plate. For the mixed distributions most real projects end up with, the wider smart switches for home range covers the spread of gang counts in one order.
The short version
Gang count, plate standard and protocol are decided in the first week and cost the most to change later. Choose them from the wall you are fitting and the market you are selling into, then let the unit price follow. Everything after that is specification work, and it is the part that is genuinely flexible.
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