Carrier Frequency VHF Transmission Power Less Than 30mW Transmission Mode FM Power Consumption 70mA, Max. Battery 9V (or 8.4V Rechargeable Battery) Wireless Receiver: Audio Output Power 45W (Max.) S/N Ratio > 60dB Frequency Response 100 - 12,000 Hz Sensitivity 10dBuV Recharge Time 8 Hrs Battery Capacity 3 Hrs (12VDC, 2.2AH) Service Range 100ft (30M) Dimensions (W X D X H) 228 X 138 X 308mm (9.0" X 5.4" X 12.1") Weight 7.7 lbs (3.5Kg)