1 Channel 433MHz WiFi and RF Relay Switch: Add WiFi and 437MHz remote control functionality to your garage door, fireplace, or other home appliances. Compatible with RF remotes as a channel, making it convenient for children and elderly users. Built-in 433MHz RF receiver supports fixed-code learning (433MHz remote control included). Works with Alexa, SmartThings Hub, Echo Plus 2nd Generation (L9D29R), Echo Plus (ZE39KL), Echo Show 2nd Generation (DW84JL), and Echo Studio. No third-party app required—simply plug in and say “Alexa, discover devices.” Features ZigBee 3.0 protocol for one-touch pairing with SONOFF ZBBridge or Tuya Zigbee gateways via the app. Offers three working modes: self-locking mode for use as a wireless switch, momentary mode for use as a smart button, and interlock mode available for 2CH and 4CH setups. Supports timer and scheduling functions for countdown or loop operations to enhance convenience. 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. Operating voltage: USB 5V or AC/DC 7–32V.