Long story in short, it's a 5V wifi inching/selflock relay module by for . Just like a standard for switch, you can use it to work with app, for , for Home, for IFTTT..etc. The 5VDC input, nano size and dry-contact output makes it different from traditional for product, this product is a wireless switch supports inching /self-locking mode. Users can add the device to the APP 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 , available on both Android and iOS. Supported functions include: Remote turn on/off, Timing Schedules, Device Sharing, Group Management. Works with for , , for Tap. Works with for Home, for Nest. Works with for IFTTT. Works With for This product works with for . You can ask 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): for , turn on {deviceName}; for , turn off {deviceName}; for , turn {deviceName} off; for , turn {deviceName} on; for , schalte Gertename ein; for , 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 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 on/off toggle button to turn on oroff connected device. Power Supply: 5V DCDry contact outputMax Current: 10AHumidity: 5%-90%RH, Non-condensingOperating Temperature: 0C-40C(32F-104F)Nano size: 34.5 x 25 x 19mmSupports status tracking: device status is timely provided to .Supports max 8 enabled scheduled/countdown/loop .Works with for , , Afor TapWorks with for Home, for Home Mini, for NestWorks with for IFTTTDry Contact OutputLow Power Supply - 5VDC low voltage inputLAN Control - Turn on/off the device even when WiFi has no Internet accessApp Support - Free iOS and Android mobile App Remote ON/OFF-Turn electrical devices on/off from anywhereSync Status-Real-time device status provided to AppTiming-Set scheduled/countdown to turn on/off at specified timeShare Control- Control your smart home together with your familyScene-Turn on/off a gang of devices with one tapSmart Scene-Triggered on/off by temp, or other environmental conditions from sensorCompatibility -Works perfectly with for , for Assistant, for IFTTT, Color: As ShownMaterial: PCB Package Contents:1 * for RE5V1C Relay Module Only the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.