Supporting Bluetooth V4.3, these noise cancelling earphones by Loud deliver a rich audio experience while still maintaining comfort and aesthetics. With a transmitting distance of 10 meters, the earphones deliver a crisp sound experience while a frequency range of 20-20 KHz means that the sharpest and dimmest notes of sound can be delivered in full detail. A short charging time of 2 hours allows you to use the earphones for a prolonged period of time.