The United Security Products AVD-2005 Automatic Voice Dialer is one of most comprehensive automatic voice security dialer available. Representing an exciting new level of achievement, the Automatic Voice Dialer combines technologically advanced features, ease of programming and reliable operation in a compact, unobtrusive dialer completely compatible with any security alarm system. The Automatic Voice Dialer is capable of monitoring low power conditions. A bank of four switches are easily accessible on the back panel to select which channels to monitor. When incoming power drops below 12VDC, the selected channels will dial the pre-programmed numbers and sends "BEEP" notification of the low power condition. The Automatic Voice Dialer features busy-line and no-answer detection to ensure prompt transmission of up to 4 prerecorded messages delivered sequentially to as many as 8 standard telephones or cellular phone. When activated, the dialer instantly begins calling the numbers in sequence, delivering each message 1 to 3 times in a row, in accordance with the preselected number of dialing attempts. Ideal for Boats, Motor Homes and Remote Locations