Block Caller Id Dialer - Dials67 When Phone Goes Off-hook - Ideal for Collection Agents! It works on any standard analog phone lines (PSTN and VOIP) Programming is done locally or remotely via the dialpad of any DTM phone Line powered (no batteries required) Size: 1.5" x 0.5" x 0.5" -- Weight: 1.8 ounces, Color: White It can be program to auto dial any number up to 50 digits long e.g. 1010XXX number for cheap long distance, Security and emergency phones, Interactive Voice Response (IVR) systems, Automated Teller Machines (ATM's).