Active Noise Canceling Wireless HeadphoneBluetooth Version: V4. 0 Bluetooth range: 10 m (free space) Transmission frequency: 2. 402 GHz 2. 48 GHz Bluetooth profiles: HSP HFP A2DP AVRCP Headband Material: metal Driver units: 40mm Noise reduction value: 18dB 20dB Mic Size: 4. 0 * 1. 5mm for hands give call Cushion set Size: protein material, 9. 5 cm (L) * 8 cm (W) Wear case: cloth material Aux cable length: 1. 5 m Battery capacity: built in 400 mAh lithium battery Charging voltage: micro usb 5
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