Looking for a flash light switch via Wi-Fi

Apart from the materials and the high-quality workmanship, the products do not differ much at first glance from, for example, Shelly. Technologically, however, the radio technology used is an in-house development that is compatible with Wi-Fi (the WLAN we know). An excerpt from an official document from the manufacturer:

The boxes also look very interesting. Thank you for the hint.

That looks like an interesting solution. I could start with stand-alone switches and receivers and then integrate it into a smart home solution at a suitable opportunity. I don't want to have to do that right at the beginning. Due to family commitments, I don't really have the time to devote myself to such things intensively enough. This kind of topic needs to be something that can be checked off in one evening.

How many modules of which type are needed?

I initially need wireless switches for 2 lamps. The light switches for them are currently next to each other. The new switches will also be placed next to each other. Therefore, preferably one control or switching unit each with 2 inputs and outputs.

You then need 2x relays (switchBox) for the two lights. If possible, you could also use a double relay (switchBoxD) and control both lights with it. The double relay costs exactly the same as a single relay. So you save almost €60! The two old switches then also go to the SwitchBox(D), or you can fill that in if you only want to switch from the new location. For the new control point, you only need one inBox. It has 4 inputs (4 buttons). Here you could use a switch with a double rocker and switch both lights with it. Best regards