Product Description Control electrical devices such as lamps, heaters, white goods & PC/AV equipment from your Smartphone without the need for a landline/broadband internet connection. Simply insert a PAYG or contract SIM in to the device [its SIM-free, unlocked], download our free i OS or Android App & control your connected devices from anywhere in the world where you have a phone signal]. Set timers, receive alerts for power loss, even control temperature with the included thermostat. This unit uses SMS messages to communicate, costs may vary depending on your tariff, location, or provider. The ENER022-MS consists of one ENER022-M & one ENER022-S. The ENER022-M GSM remote controlled plug adapter can be controlled anytime & anywhere from a mobile phone using a PAYG or contract SIM card. The ENER022-S is a slave wireless radio frequency controlled adapter controlled at short range up to 25 meters in open space by the master ENE R022-M GSM device. Technical Information Input 100v-250v/50 Hz Output: Maxiumum 13A 433.92 M Hz radio for local control Manufactured to BS5733 Auxiliary DC output 12V/0.5A Product Code: ENER022-M