Characteristics and Interoperability 40MM Drivers for crystal-clear sound: Perfectly clear audio that is painless! Listen to your music as it was intended to be heard. Extended Battery Life 20H: designed to hold a sizable rechargeable battery that can play music for up to 20 hours. Everything is under your control: The touch area located beneath the right ear cup makes controlling the headphones easy. Connectivity in two modes: Integrated Microphone 20H Extended Battery Life