Model: Aker MR2100 Color: Black Peak Power output: 12 Watts Frequency response: 100hz ± 13db1khz ± 1db Dimensions: 4.13” x 3.31” x 1.38” (105mm x 84mm x 35mm) Weight (w/ Batteries): 0.92 lbs (420 g) Voltage : 7.5v Current consumption: 150mA Speaker Sensitivity: 53 dBV/A +- 3 dB Power Source: Built-in Lithium Rechargeable batteries Battery Life: 10-15 hours, 6 hour recharge, 2-3 year life (replacements available) Also included: Headset microphone, Charger cable (US plug), MP3 cable (male to male 3.5mm), MP3 line in port, Microphone line in port, Removable belt clip, adjustable waist band, Carry bag.