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1: Suitable for car audio system 2: Up to 12 meters operating distance 3: Automatic shut-off after 10 minutes of no signal detected 4: Ultra light design for comfortable wearing 5: Mini jack for audio input like MP3, iPod 6: Built-in 30 mm Mylar speaker to deliver audiophile grade sound quality 7: System infrared light: 850nm 8: Carrier frequency: 9: - A channel: left channel: 2.3Mhz Right channel: 2.8Mhz 10: - B channel: left channel: 3.2Mhz Right channel: 3.8Mhz 11: Signal to Noise: > 60db 12: Channel Separation: > 45db 13: Distortion: < 1% 14: Frequency Response: 30-20000Hz 15: Power Supply: 2 x AAA Batteries (Not Included)