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. Ensure Bluetooth is enabled on your phone. 3. For Android devices, the operating system must be version 4.0 or higher. 4. Ensure your device can access the internet and download apps from official app stores. 5. If your wireless router uses MAC address filtering, disable this feature via the router’s admin settings. 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 included 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 may 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 Dimensions: 81 × 76 × 28 mm Color: White Material: ABS Package Includes: 1 × Smart Switch Note: Colors may vary slightly due to screen settings and lighting conditions. Measurement tolerance: ±1–3 cm.