1 Channel 433MHz WiFi and RF Relay Switch: Add WiFi and 433MHz remote control functionality to your garage door or fireplace. Can pair with RF as a channel, convenient for children and elderly users. Built-in 433MHz RF receiver supports 433MHz fixed-code learning (433MHz remote control included). Compatible with Alexa, SmartThings Hub, Echo Plus 2nd Generation (L9D29R), Echo Plus (ZE39KL), Echo Show 2nd Generation (DW84JL), and Echo Studio. No third-party app requiredjust plug in and say Alexa, discover devices.Zigbee 3.0 protocol, one-touch pairing: With Zigbee 3.0, quickly connect to SONOFF ZBBridge or Tuya Zigbee gateways by tapping once in the app.Three working modes: Suitable for DIY garage door openers and other home appliances. Working voltage: USB 5V or AC/DC 732V. Operates as a wireless switch in self-locking mode, as a smart button in momentary mode. 2-channel and 4-channel versions support interlock mode.Timer & Schedule: Set countdown or loop timers for automated operation and enhanced convenience. Package includes: 1 x Zigbee wireless module + 1 x 433MHz remote control. Note: 1-channel and 2-channel modules are compatible with Tuya and eWeLink apps. 4-channel modules are not compatible with Tuya and eWeLink apps simultaneously.