... and alarm; caller tracing Model:Central Monitoring Station R-2005GSupport Contact ID, DTMF, 4+2EXPRESS, With LCD Display For Showing DataSupport ... residential compounds. The receiver is capable of receiving signals in CONTACT ID,4+2 EXPRESS,4/2,4 /1 and 3 ... 1. Caller ID display and alarm; caller tracing; 2. Automatic CONTACT ID,4+2 EXPRESS,4/2,4 /1 and 3 ...