Caller ID (430-0954) Specifications Faxback Doc. # 8015 Power Requirements...............................................9V DC Memory Capacity.........................................100 Calls with Incoming Number Only or 50 Calls with Name and Number Dimensions..........................5 7/8 x 3 1/2 x 1 1/2 Inches (HWD) Weight.........................................................6.7 OZ. Operating Parameters Interface...................................................Loop Start Ringer.........................................Standard Bridged Ringer 16-66 Hz Sine or Square Wave 40-130 Volts Ring Signal Resistance..........................Greater than 5 Megohms (jlc-03/02/94)