GSM remote Control Switch Remote control via your mobile phone, Work anywhere in the world where there is GSM cell phone network. This GSM Switch allows switching almost any Industrial or household appliances On or OFF remotely via mobile network. Simply call a number and if the number calling 'Caller ID' is known, then one of the on-board relays is switched to control connected equipment such as lights, gates, doors, heating and more. User can Control & Monitor Machinery / Automobiles / Irrigation pump sets / lights / Heating / Security systems / Tank level / Remote servers & routers, Industrial, Home & Office appliances by any Mobile or Land line phone from anywhere in the world. Technical Specifications :- Micro controller Based Multi-function programmable SMS & DTMF Based functioning (call based) Programmable relay latching Optically Isolated 2 Relay output C NC Operating temperature -20°C to 60°C Weight 350gm Can be operated from anywhere, no distance limit. Retun SMS Alert / Beep indication Quick response time Comes with free Android application Easy commands for configuration