Telephone Listener (430-0231B) Specifications Faxback Doc. # 6381 Output Power at 10% Distortion:........................................................450 mW Frequency Response (-6 dB at VR max):.........................................180 Hz-5000 Hz Power Requirement:.....................................9V DC from battery Weight:....................................................5.2 oz (150 g) Dimensions:..........................1 23/32 x 3 1/2 x 4 3/4 Inches (HWD) (43.5 x 89 x 120 mm) (CJD/smc-04/29/94)