SONOFF Basic R4
Click here to check the User Manual: 
BASICR4 is a smart switch with the gateway function of “eWeLink-Remote”. You can add “eWeLink-Remote” sub-devices, use S-Mate2 or R5 to pair with BASICR4, and then set the scene, you can reach the two-way control and local control. You can still control the light switch through the app even turning off a traditional wall switch. No matter the wall switch or app remote control, you can enjoy the smart world. With the product’s built-in temperature sensor, the real-time maximum temperature of the entire product can be detected and speculated, which prevents the product from deformation, melting, fire, or live devices from exposure in case of over-temperature. BASICR4 has obtained CE, FCC, ETL etc certifications.
