HA-G08 GSM Power Socket Details: Use mobile phone call or send message to this GSM switch to switch on/off the power socket, that to control the electrical appliances. It works in any places with GSM signal available, what means you could cook rice in office, feed pets during trip. Work with home and industrial electric appliances, like water heaters, electric motors, electric doors, lights, rice cookers, water pump, etc. This product only works with 110V ~ 220V AC voltage