The UP200-GSM-RD is an intercom unit which, like a cell phone, can call the owner’s mobile or landline phone. By pressing the call button on the intercom, a voice connection is made in a few seconds, just like when talking via a conventional intercom system. This makes it possible for the owner to receive a visitor’s calls and talk to them at any time and from anywhere, even when not at home. The unit may be programmed with up to one hundred numbers to allow a door or gate to be automatically opened. A solar powered version is available to allow use in remote areas where mains electricity would be difficult to supply.