100m range Wireless high quality closed type headphones, with up to 100m reception range Noise reduction system Reproduces a clearer sound & reduces distracting ambient sounds, so all you can hear is the music 40mm driver unit Delivers a wide frequency range & broader dynamic range, to reproduce accurate sound Automatic tuning Enjoy the highest quality signal transmission, with automatic tuning built-in Battery life Listen for longer with up to 25 hours battery life, & automatically charge via the secure stand Ease of Use Adjust volume levels quickly & easily via controls built-in to your headphones