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Additional pair of 2.4G Wireless Headphones for Quartet/Duet/Audiplex*
• Carrier frequency: 2.4GHz
• Frequency response: 20Hz - 20KHz
• Headphone battery life: 20 hours play time
• Charge time: 3 hours
• Distortion: 0.5%
• Signal - to - noise ratio: 85dB
• Headphone
• Charging Cable