Enhanced band-pass filters at higher and medium frequencies which effectively reduce interfering signals.
Resist disturbing strongly, limits noise output.
Quartz frequency stabiliser used to improve performance consistency.
Special circuitry designed to eliminate popping noise when turning the transmitters on or off.
Audio signals compressed and then reformed to further reduction of noise and improvement of dynamic range.
With a wide using range for over 30m and 60m max in a good surrounding.

Receiver Frequency Range: VHF 220-270 MHz
Receiver Distance: >50m(perfect state)
Max Excursion: +/-5KHz
Frequency Steadiness: +/-0.005%
S/N Ratio: >100dB T.H.D:<0.5%
Frequency Response: 80Hz~20kHz
Sensitivity: input 10-15dBu S/N:70dB
Mute Mode: Locked
Audio Frequency & Noise Resonance Interfere Rate: >80dB
Output Plug: XLR balanced / P unbalanced
Transmitter Power: 10mW
Auxiliary Harmonic: >-50dBc
Receiver Power Supply: DC 16.0V,250mA (CCC criterion)

One Tie-clip wireless microphone and one hands holding microphone