# frequency: VHF 220-280MHZ
# using quartz circuit with have stability
# with audio output and mix audio output alone,it can connect with mixer and amplifier
# using filter with mulitlevel narrowband high frequency and internediate frequency.
# with multi-circuit to monitor noise and keep strong anti-jamming .
#using cardioid sound collector to increase sound and bata background noise.
# it can work when the battery without power # best distand:30-50meter.
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