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Description:1) Frequency:(210 Channels 87.5 -108.5MHz) 2) Preset + - channel selected 3) Audio frequency range: 20Hz to 18kHz　 4) Operating range: 10-30 feet 5) Power light and frequency LED indicator　 6) Battery 2 AAA power model supply 7) 2 AAA batteries included . 8) 1-year warranty Product description: The product adopting a high-tech ic, after by disposing the "Stereo"double-channels sound signal of MP3 or CD, it transmit adopting broad band frequency modulation tiny-power mode, (pleaserefer to standard of broadcast and TV station of prc for details. ) there are four channels can be selected, and it can protract the batteries life. If the voltage is low to 0.9v, it also can operate naturally.