Premium Active Noise Cancelling Bluetooth Wireless Headphones. Bluetooth Version: CSR 8635, version 4.1. Battery Capacity: Li-Polymer 250 mAh, lasts around 8-10 hours, takes 2-3 hours to charge and can standby for over 300 hours. Headphones have a wireless range of 10 feet, frequency of 20Hz—16 kHz and microphone sensitivity of 40±3dB. Comes in Neat Gift Box Packaging.
