Please check the following before using this device: 1. Your smartphone or tablet has been connected to a 2.4G WiFi network that can access the Internet (5G WiFi is not supported) 2. Turn on Bluetooth on your phone 3. If you use an Android phone or tablet, the system must be version 4.0 or above 4. When using a phone or tablet, you must be able to access the app store and download the app 5. If your wireless router is set up with MAC address filtering, please log in to the router settings to disable the filtering function 6. This device must be used in conjunction with a Zigbee gateway Product instructions: 1. Search "Tuya Smart" in app stores and major application markets 2. If prompted for permission during the installation process, please select Allow 3. Register an account and log in to the Tuya Smart app 4. Follow the instruction manual for correct wiring. Installation while powered is strictly prohibited 5. After completing the wiring, turn on the power. The device's default setting for incoming calls is off. You can change this setting in the app to enable or manage incoming calls Specifications: Input voltage: DC 5V / 85-250V AC Maximum power: 2200W / 10A Wireless Standard: 2.4GHz b/g Working temperature: -20C to 70C Product Size: 81 x 76 x 28 mm Color: White Material: ABS Package Contents: 1 x Smart switch Note: Light reflection and different display screens may cause slight color differences between the image and the actual item. Measurement error is permitted within +/- 1-3 cm.