The 4G GSM Multi Switch is designed to be connected to your electronic devices so that you can activate them from anywhere in the world using your mobile phone. This can prove very useful in a variety of situations. Simply dialling the device switches the device on or off. Alternatively, you can also send a text message telling the device to remain switched on for a period of 1 - 999 seconds or minutes. As soon as you have executed a command, the device sends back a confirmation by SMS so that you know that it has executed your command. The GSM 4G Multi Switch differs from other models on the market due to its quad-band frequency. The device is also housed in an IP65-rated casing, making it perfectly weatherproof for outdoor use and has also passed tests in high temperatures and freezing conditions. The GSM Multi-Switch (12V) is designed to control electrical devices with your mobile or landline. It is very easy to install and operate, with no complicated coding, just plug in and go. Simply dial or text the SIM card number to operate the relay. When you call the device, it will reject the call so you will not be charged. You will receive a text confirmation to switch the relay on or off.