Model WS-USC04 manufactured by Xiaomi
Zigbee ID: "lumi.switch.b2naus01"
Confirmed working with
Pairing InstructionsPress and hold the button on the device until the blue light starts blinking, release it and the pairing should begin.
If you're having connection or pairing issues read Xiaomi & Aqara Devices - Pairing & Keeping them connected.