I bought the Sonoff Touch for US version. I have installed and paired the device, now it is working with eWink. However, this device should never be sold to the US and will never pass the UL certificate. For the following reasons.
1. Basic design flaws. The US electrical wiring for home in wall installation basically takes the Romex or Beamex format and the wires they provided are solid wires(photo 1). The basic design for Touch dose not allow margins for the screws to protrude from the mounting braket. (photos 2 and 3). In order to install it, the bracket must be filed down with notches like the photos 2 and 3.
2. The latches of the Touch is too week to handle a solid wire installation(photo 4), basically it is about 1/2" from the wall bracket and the wires are exposed, After install the Touch, I have to use wires to tide it down (photo 5). This is absolutely not acceptable in electric code. In the US, plate covers are tide down with screws.
3. Apparently the switch require constant power to provide the wifi function. The US single cable (Romex or Beamex) wall installation comes in three wires, a ground, a neutral and a hot. The switch has provisions on neutral and hot wires, but has no provision for the ground wire. An ungrounded wire was used up to the 1960's but since 1970, it has been the standard for three wire grounded installation.
4. Most homes has three way switches. Touch has no provisions for a three way switches.
The whole Touch concept is fine, but you'd better come here to learn about electrical system and codes (law).
Also, the two button Touch is not going to solve the three way switch. Please review the three way switch concept in the following youtube video
Please note that three way switch will not have full time power in each switch
You should review this from Youtube
The screw you showed above is all the way in, if you have it half way, you cannot fit into the frame
1.Why not allow margins for the screws to protrude from the mounting braket? from the attachment picture 1,you can see there have rooms to release screws.
2.I don't why other people used it haven't this problem.Maybe you can show me more details like the size of device.that i can send it to our R&D team.
3. Maybe you are right.
4.We will release two button touch future.