Details Sony WF-C700 Truly Wireless Headphones are compact and lightweight wireless headphones designed to fit snugly in your ear for all-day comfort. Features DSEE technology that provides high-frequency sound with Extra Bass. It flaunts an ergonomic surface design to ensure hour after hour of listening comfort and a more stable fit. The WF-C700 headphones offer stable and reliable wireless connectivity. Easy button operation lets you play, stop or skip through tracks and adjust the volume. Sony WF-C700 Truly Wireless Headphones offer IPX4-rated splash and sweat-proof construction to withstand intense conditions. These earbuds provide up to 10 hours of battery life (NC off). Specs Weight 4.6 g x 2 Headphone Type Closed Driver Unit 5mm Frequency Response(Bluetooth Communication) 20Hz-20000Hz Volume Control Yes Waterproof Yes (IPX4) DSEE Yes Battery Charge Time Approx. 1.5 hrs Battery Charge Method USB Charge Battery Life (continuous music playback time) Max.