Caller ID (430-0951) Specifications Faxback Doc. # 8017 Power Requirements...............9 Volt Alkaline Battery, 2.5 mA - 8mA Memory Capacity.....................................................10 Dimensions.......................1 1/2 x 3 5/16 x 5 5/8 inches (H-W-L) Weight...........................................................5 Oz. Operation Parameters Interface...................................................Loop Start Ringer.........................................Standard Bridged Ringer . 20-60 Hz sine or square wave 40-105 volts ring signal Current...................................6-15 VDC (off hook) 20-70 mA Resistance.........................6M ohm (on hook) 300 ohm (off hook) (jlc-08/16/93)