Totally self contained GSM entry systems from 1 to 12 call buttons. Requires only Sim card. Door panel, Psu and antenna included. Facilities include divert one or more (Max 5) numbers, dial in to open facility (no network charges and for up to 250 telephone numbers), signal strength checking and alarm output with text message. Programming is by either SMS or PC software (GSMPRO software available separately). There are also auxiliary input and outputs. A codelock can be added (/CL). Systems are available up 50 button or digital.