Sony Truly Wireless Headphones with EXTRA BASS are powerful and deliver punchy low-end sound. Your favourite basslines never sounded so good. Built-in Bluetooth connectivity Secure fit with Ergonomic Tri-hold structure IPx4-rated water resistant Voice Assistant compatible Built-in microphone Up to 18 hours of battery life Ergonomic Tri-hold structure WF-XB700 earbuds are ergonomically designed to make contact with three different points on your ear for a secure, comfortable fit. Stable, reliable Bluetooth connectivity A Bluetooth chip, which transmits sound to left and right ears simultaneously, coupled with optimised antenna design, ensures a stable connection and outstanding listening. Low audio latency makes for enjoyable viewing too. Easy hands-free calling Conversation flows freely with easy hands-free calling, thanks to the built-in microphone. No need to even take your phone out of your pocket.