Now with active noise cancellation and 60 hours of pre-charged sound, the Flex Bluetooth Active Noise Canceling Headphones offer quiet studio comfort for all-day, uninterrupted listening. Flex Bluetooth ANC reduce environmental noise by 94% for long hours. With ergonomic Form-Fit Earcups, stainless steel metal backbone and award-winning sound, the JLab Flex Bluetooth ANC Headphones are the go-to for any traveler, music lover, or bold city-goer.