I opened one of these last night.
Its a snap fit, no glue or ultrasonic weld.
The device is using a Realtek Ameba Z2 RTL8720CF
Single PCB with components both sides. To remove the PCB, the two large solder contacts need to be removed - beware, the PCB has tracks both sides here.
There’s no additional flash/rom on the PCB.
Very simple circuit, very little to see.
The antenna is on the main PCB and towards the bottom of the case.
The relay is an Omron brand.
I’ve attached a photo.
