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 an Apple phone or iPad, ensure you can 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 and disable the MAC filtering function 6. This device must be used in conjunction with a Zigbee gateway Product instructions: 1. Search "Tuya Smart" in the App Store or major application markets 2. If prompted for permissions during installation, 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 hold incoming calls Specifications: Input voltage: DC 5V / 85-250V AC Maximum power: 2200W / 10A Wireless Standard: 2.4GHz b/g/n Working temperature: -20°C to 70°C Product Size: 81 x 76 x 28 mm Color: White Material: ABS Package Contents: 1 x Smart switch Only the above package content is included; other products are not included Note: Light reflection and different display screens may cause slight color differences between the image and the actual item. Measurement may vary by +/- 1-3 cm