Features: 1Easily control many electrical appliances through only a text or a phone call 2Up to 5 different mobile phone numbers can be pre-set in the system 3Using caller ID for identification unknown callers are ignored so it is of security assurance 4According to the corresponding frequency it can be operated from anywhere no distance limit 5Great for control of home electrical devices such as server lamp computer refrigerator TV wireless router and so on Specification: Features: Easily control many electrical appliances through only a text or a phone call. Up to 5 different mobile phone numbers can be pre-set in the system. Using caller ID for identification unknown callers are ignored so it is of security assurance. According to the corresponding frequency it can be operated from anywhere no distance limit. Made from aluminium alloy shell it is easy to dissipate heat and can effectively prevent fire hazards as well. Comes with the controller and antenna and it is easy to install and operate. Can be used for authorized door access controlling gates switching of remote equipment car parking systems etc. Great for control of home electrical devices such as server lamp computer refrigerator TV wireless router and so on. Specifications:Work frequency: 850 / 900 / 1800 / 1900MHzInput power: 0.9WOutput current: 10AMax. output power: 2200WMaterial: Aluminum Alloy ShellSize: 155 * 65 * 32mm / 6.1'' x 2.56'' x 1.26''Package Weight: Approx. 350gPackage Included:1 x GSM Controller1 x GSM Antenna1 x AdapterNote:1. It is easy to install but professional installation is highly recommended.