Galaxy Audio JIB/MM Owner's Manual page 7

Noise
S/N: >80dB
Misc.
Batteries: 2 x AA Alkaline
Typical battery Life: 15 Hours
Physical Size: L: 7.18" [182.37mm]
W: 4.028" [102.31mm]
H: 2.09" [53.09mm]
Weight: 2.26 lbs, 1.025kg
DC In Requirements: 4.5VDC (regulated), 500mA minimum.
Barrel plug: 4mm O.D. and 1.74mm I.D., center positive.
Compatible Galaxy Audio AC Adapter: JIB/UA4.5-14
5