Waistband Amplifier with Clip on Microphone AC Adaptor Output DC 12V/300mA, Battery 6"AA" (UM-3) type batteries (not included). Built-in Speakers 2.5" 6.6cm Paper cone speaker, Decibel 85~90dB, Dimensions 1808065.5mm (7.1"3.2"2.6"). Frequency Response 100~15kHz, Headset Microphone Condenser 680. Power Output 5W Max, Range 30~50m depending on operating conditions. Recharge Current 70mA~150mA, Speaker Impedance 4, Weight 330Kg (1.87 lb) (without battery).