1 Channel 433MHz WiFi and RF Relay Switch: Add WiFi and 433MHz remote control functionality to your garage door, fireplace, or other home appliances. Can pair with RF remotes as a channel, convenient for children and elderly users. Built-in 433MHz RF receiver supports 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 enables one-touch pairing: Easily add the device to SONOFF ZBBridge or Tuya Zigbee gateways with a single click via the app.Three working modes: Suitable for DIY garage door openers and other home appliances. Operates on USB 5V or AC/DC 732V power. Functions as a wireless switch in self-locking mode, as a smart button in momentary mode. 2-channel and 4-channel models support interlock mode.Timer & Schedule: Set countdown or loop timers for automated control and 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 both Tuya and eWeLink apps simultaneously.