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Bluetooth version: V4.0+EDR Transmission distance: 10 meters Battery capacity: 350MAH Talk time: 20 hours Music time: 15 hours Standby time: 200 hours Charging time: 1-2 hours Speaker：16Ω10mW x 2 Sensitivity: DBM -80 Signal to noise ratio: 95dB Bearing: all directions Frequency range: 2.402GHz-2.480GHz Transmit power: 0dBm. Second (4dBm Max) Working voltage: 3.7V Working current: 18mA Amazing Battery Life Standby time up to 200 hours, music time up to 15 hours and talking time 20 hours, and you can see the battery indicator on your phone notification bar (it works for both Android and Apple). No need to worry about the battery life, just enjoy your trip and sports! Crystal clear sound Whether it's the calls or the music, the sound of this Bluetooth Headphones comes in very clearly and loudly. The Noise Cancelling quality for calling sounds natural and works great. Smart Neckband Design Having the freedom to move around and free your hands for other things, without the hassle of wires dangling around your body, and don't need to worry that the earbuds will drop off.