Description: Long story in short, it's a 5V wifi inching/selflock relay module by SONOFF. Just like a standard SONOFF switch, you can use it to work with eWelink app, Amazon Alexa, Google Home, IFTTT..etc. The 5VDC input, size and dry-contact output makes it different from traditional SONOFF product, this product is a wireless switch supports inching /self-locking mode. Users can add the device to the APP eWeLink in order to remotely control connected home appliances or devices. In self-locking mode, customers can remotely turn on/off connected devices immediately. When in inching mode, customers can have two wiring ways to select: Turn on 1s and then auto-off Turn off 1s and then auto-on. The product enables remote control of home appliances through the mobile application eWeLink, available on both Android and iOS. Supported functions include: Remote turn on/off Timing Schedules Device Sharing Group Management Works with Amazon Echo, Echo Dot, Amazon Tap Works with Google Home, Google Nest Works with IFTTT Works With Amazon Alexa This product works with Amazon Alexa. You can ask Alexa to control the device with the following voice commands. Please note that only US/UK English and German voice commands are supported now. Try out these phrases ( {deviceName} should be the name of your device): Alexa, turn on {deviceName} Alexa, turn off {deviceName} Alexa, turn {deviceName} off Alexa, turn {deviceName} on Alexa, schalte Gertename ein Alexa, schalte Gertename aus For detailed tutorial, please click here. There are two working modes for the product: inching mode and self-locking mode. Users can press the self-lock/inching mode button to switch between these two modes. When the module is switched to self-locking mode, users can turn on/off the connected appliance instantly. When the module is switched to inching mode, users can press on/off toggle button to turn on or off connected device.