20 Way Coaxial Cable Mapper    The CM20 is designed to quickly map up to 20 speaker, coax, or security/alarm cables at a time.    The LED displays the unique number of the remote identifier attached to the other end of the cable run. If it detects a short, the LED displays “SH”. When voltage is detected,"lightning  bolts” appear. To conserve battery life, unit powers down automatically if the connection  is not removed in approximately 2.5 minutes.    Brand: Revez Model: CM20 Made In Taiwan   Features:   ♦ Map up to 20 audio, coax, or security/alarm cable  runs at a time ♦ High intensity LED display readable in any lighting  environment ♦ Auto-On and Auto-Off ♦ Low Battery Indicator ♦ Voltage Detection and Warning ♦ A short circuit is detected, “SH” is displayed ♦ Alligator Clip and F-connector contacts ♦ Maximum cable length for testing: 4000 Ft (Approx 1,200m) ♦ Maximum DC cable resistance: 100 Ohms ♦ Battery: 3 x 3V CR2302 Batteries   Includes 20 serial-number terminators  Coax to Alligator Clip adapter  Nylon Case   Note : Do not connect to live AC circuits. This could cause an extreme hazard and damage the CM20.