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Specifications:
-Capacity:2000 mAh
-Output: 500 mA
-Input/Output voltage: 5V
-Battery type:rechargeable Li-ion
-Charging time: up to 5 hours
-Standby time: up to 60 days
frequency response 20 Hz - 20 kHz impedance 32 Ohm sensitivity 103.5 dB cordless headphones Yes operating distance 10 m Headset Yes acoustics closed type noise canceling No automatic on/off sound No