Digital technology effectively eliminates the problem of crosstalk Range UHF, PLL technology 100 × 2 channels, 250 kHz spacing; Double superheterodyne design, high reception sensitivity mute function effectively reduces the on / off noise Function IR interface microphone with base Hours microphone approximately 6-10 hours Structure with increasing voltage microphone provides operation at low voltage The microphone is automatically switched off after he was shot by hand for 3 seconds, standby 5 minutes and off for 15 minutes Parameters Frequency range: 645-693 MHz Frequency stability: ± 10 ppm Number of channels: 100 × 2 The amplitude-frequency characteristic of 40 Hz-18 kHz Distortion: ≤ 5% (at 1 kHz) The ratio S / N: ≥110 dB Admission: double superheterodyne Modulation: FM Transmission Power: 3-30 mW Receiving Sensitivity: -95 ~ -60 dBm Reception range: 100 m (the ideal environment indoors) Transmitter power source: two AA batteries Receiver Power source: DC 12V Power consumption: ≤10 W