Takstar TS-7210 (White) UHF wireless microphone system is redundant and dual antenna ensures an interference-free reception. The transmitter has a battery charge indication (lit green when the power is normal, flashes green when the low charge) Silica frequency doubling technology lock preventing interference noise and impulse noise, and improved SNR. Power microphone: 2 pieces x 1.5V AA & bull; Frequency range: 790MHz 805MHz & bull; Frequency control: PLL & bull; Channel: fixed & bull; Receive Mode: dubbed & bull; Frequency: 60Hz-15kHz & bull; Max. Frequency deviation: & plusmn; 45 kHz & bull; The signal / noise ratio:> 80 dB & bull; THD: <0,5% & bull; Receiver sensitivity: -90dBm & bull; Dynamic range:> 100 dB & bull; Audio Output: unbalanced nest & Phi; 6.3mm & bull; Transmitter power <10mW & bull; Running time: approx. 10 hours (depending on battery power) & bull; Operating range: 50 meters in open air