GSM switch can be controled by phone call or message from global. item build in Gamany chipset, 10A/277V high stable relay and GSM antenna：

1. in industry it can control unmanned base, computer server, exhaust fan, electromagnetism valve etc.
2. in home it can control Household appliances. such as electric cooker, air-condition, electric radiator etc.
3. With electromagnetism door lock and window electromotor it can control door and window open from remote place.