How do they work?
Our systems have built in mobile phone in which a SIM Card is installed. This gives your gates, barrier, door or shutter door a unique mobile phone number. When it recieves a call, the system reads the Caller ID of the incoming call at the same time as disconnecting the call so no call cost is ever incurred.
By storing the phone number of regular visitors to your site in the unit, they can let themselves in by making a quick free call identifying themselves. Entry can then be controlled by time as to whether you want to allow daytime only access or 24 hour.