Please check the following before using this device: 1. Your smartphone or tablet is connected to a 2.4 GHz Wi-Fi network with internet access (5 GHz Wi-Fi is not supported). 2. Bluetooth is enabled on your phone. 3. For Android devices, the operating system must be version 4.0 or higher. 4. Ensure your device has internet access to download the Tuya Smart app. 5. If your wireless router uses MAC address filtering, disable it via the router’s admin interface. 6. This device requires a Zigbee gateway to operate. Product Instructions: 1. Search for “Tuya Smart” in major app stores and download the app. 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. Do not install or wire the device while powered on. 5. After completing wiring, power on the device. By default, incoming call notifications are disabled. You can enable or customize call handling settings within the app. Specifications: Input Voltage: DC 5V / 85–250V AC Maximum Load: 2200W / 10A Wireless Standard: 2.4 GHz IEEE 802.11b/g Operating Temperature: –20°C to 70°C Product Dimensions: 81 × 76 × 28 mm Color: White Material: ABS Package Contents: 1 × Smart Switch Note: Colors may vary slightly due to screen settings and lighting conditions. Dimensional tolerance: ±1–3 cm.