On-ear design for comfort during extended listening sessions. 40mm drivers and advanced acoustic technology Deliver powerful premium sound. Bluetooth 4.1 interface Enables simple wireless pairing with your Bluetooth-enabled device. Supports HFP, HSP, A2DP and AVRCP Bluetooth profiles. Rechargeable battery Offers up to 18 hours of wireless listening and talk time on a single charge, and up to 480 hours on standby mode. Built-in microphone Enables simple hands-free chatting via a compatible device. Sweat-resistant Provides protection from sweat, so you can easily wear headphones while working out.