KEF’s Mu3 Noise Cancelling True Wireless Earphones are engineered to deliver pure; accurate sound everywhere. Designed in collaboration with visionary designer Ross Lovegrove; the Mu3s deliver exceptional sound on the move while being comfortable and elegant. - Active Noise Cancellation Tuned to eliminate external sound while preserving nuance and detail - Bluetooth 5.0 For exceptionally stable connections with both iOS and Android devices - Ergonomic design For comfort and fit - Ambient mode When you need to be aware of the surroundings - IPX5 Splash-Proof Designed for all weather conditions - Up to 24-hr use 9 hours at full charge plus 15 hours with charging case - Fast Charging Fast charging of 5 mins allows for 1-hour use - Voice Call Take calls with a simple press