Sanford Wireless Microphone Sf7507mp

Element: moving coil dynamic
Polar pattern: Uni-directional
Frequency:80Hz-12kHz
Sensitivity: -53dB±3dB (0dB=1V/Pa at 1kHz)
Output impedance: 600Ω (at 1KHz)
Power supply: Transmitter:1 x 9V battery
Receiver: AC 110V or 220V
Carrier frequency: 110-118MHz
Effective range: 20-30m.