Features: Use a mobile phone to make a call or send a message to this GSM socket to switch the power socket on or off, enabling control of electrical appliances. It works in any location where GSM signal is available. Can set up 5 groups of master numbers. It can control electric motors, electric doors, lights, rice cookers, and other appliances. 1. Can only control the power supply being switched on or off; does not have additional functions. 2. Besides working directly with electrical appliances, it can only be used with other control or button-operated appliances that have a memory function. 3. SIM card requirements: A global GSM standard SIM card can be used. Does not support 3G or CDMA cards. Please activate the SIM card before inserting it into the device. 4. It is recommended that customers use a SIM card with free incoming calls, so only auto-reply message fees will apply. 5. Incoming Caller ID display must be enabled. Ensure the SIM card has sufficient balance to receive calls and text messages. 6. Do not place the GSM switch in a metal container or enclosed metal environment. 7. In areas with weak signal, SMS control may not work perfectly, which is normal. Specifications: Voltage: 220V Current: 10A Rated frequency: 50Hz Power: 2200W Material: Plastic Color: White Package Contents: 1 x Remote socket Only the above package content is included; other items are not included. Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error allowed is +/- 1-3 cm.