BARETONE AUDIO WIRELESS MICROPHONE | WM818
 
 System Parameter
 - Carrier Frequency: UHF 640-690Mhz
 - Modulation mode: FM
 - Channel: 2 * 200
 - Frequency stability: ±0.005%
 - Dynamic range: 110dB
 - Max Modulation: ±45 Khz
 - Frequency response: 80Hz(+-3dB)
 - S/N ratio: >90dB
 - T.H.D:10. Working range: About 150M(Without obstacle)
 - Working temperature range: -10C - +40C
 
 Receiver
 - Receiver mode: Haterodyne frequency conversion receiver
 - Intermediate frequency: 110Mhz, 10.7Mhz
 - Antenna switch in: BNC/50Omh
 - Rf Squeich: > 75dB
 - Max level output: ±10Dbv
 
 TRANSMITTER
 - Antena : Hand-hold microphone with built in screw antenna
 - Output power : 20Mw
 - Rf Squeich : 50dB
 - Power : DC 2x1.5V AA
 - Battery life about 8 hours