Product Description: product category: VHF product category: VHF use power supply voltage: 220V power adapter voltage: 0 power consumption: 30mW product introduction: carrier frequency: 220-270MHz adjacent channel interference ratio: 80dB; &gt frequency stability: > 80dB dynamic range; 0.005%: & gt; 90dB RF output power: 30MW harmonic distortion: & lt; 0.5% audio output: independent: 0 - + 400mV mixed: 0 - + 300mV frequency response: 40-16KHz + 3dB receiving channels: 2 receiver sensitivity: 50uS (SINAD = 20dB) receiver power supply: AC220V/50-60Hz signal-to-noise ratio: & gt; 98dB effective distance: (50-80) m (depending on the environmental changes)