Specifications: Carrier Frequency: VHF 210- 260MHz; Frequency Steadying: Less Than 0.002%; Modulation Mode: FM; Crystal controlled stabilizer; Audio Dynamic Range: Over 90 dB; Audio Frequency Response: 80Hz - 14KHz +- 3dB; Audio Output level: 0- 300mV, 3 ways out put on 2 sockets; S/ N ratio: Over 70 dB; T.H.D. Less than 0.5%; Sensitivity: 3uV for 30dB S/ N; F/ N ratio: over 80 dB; P/ N ratio: over 80 dB; Output power: 10mW; Power: AC 110V/220V 60/50 Hz; Range: 300 Feet; Transmitter power: 2 X 9V battery.