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USB9000 Computer Headset with In-line Volume Control USB headset microphone Noise cancelling microphone Control feature of volume up/down and microphone mute With 40mm NdFeB magnet speaker driver USB plug USB9000 computer headset with in-line volume control AMP-650 amplifier headphones with bass boost AMP-650 Amplifier Headphones with Bass Booster 2 x 40mm high-end NdFeB speaker Frequency: 18 to 22kHz Maximum output power: 2 x 70mW Sound mute button, volume +/- and power on/off button on earcups Power supply: built-in rechargeable lithium ion battery Recharging time: 2 hours Working time: 8 hours Connection: 3.5mm jack Detachable cable: 3.5mm jack Detachable iPhone cable MDR-690 Foldable DJ Headphones with Swivel Earcups and Crystal Clear Sound Performance With foldable design and swivel earcups Driver unit: 40mm ferrite magnet Impedance: 32Ω ± 10% Sensitivity: 110dB SPL at 1kHz ± 2% Frequency response: 20 to 20kHz Plug: 3.5mm stereo nickel plating Cable length: 2m (±5%) MDR-690 foldable DJ headphones with swivel earcups