The kef mu7 charcoal grey wireless noise cancelling headphones combine 40mm dynamic drivers, bluetooth 5.1 With aptx hd, smart active noise cancellation and up to 40 hours of battery life. Designed in collaboration with ross lovegrove, these over-ear headphones feature a distinctive charcoal grey finish, an aluminium frame, cushioned earcups and intuitive touch controls for listening at home or on the move.Kef sound with 40mm dynamic driversthe kef mu7 headphones feature 40mm full-range dynamic drivers, developed and tuned by kef's acoustic engineers to reproduce detailed sound across a frequency range of 20hz to 20khz.Qualcomm aptx hd support enables compatible bluetooth devices to transmit audio at up to 24-bit 48khz, helping preserve musical detail during wireless listening. The headphones also support sbc, aac and standard aptx codecs.Bluetooth 5.1 Provides wireless connectivity with compatible smartphones, tablets and other bluetooth audio sources, with a specified operating range of up to 10 metres.Smart active noise cancellationkef's smart active noise cancellation technology monitors surrounding noise and automatically adjusts its noise reduction processing according to the listening environment.The system uses multiple filters to target unwanted external sounds while maintaining audio reproduction. This makes the mu7 suitable for listening in environments such as public transport, offices and other busy surroundings.Up to 40 hours of wireless listeningthe kef mu7...