Evike Tactical Built-In Wireless Bluetooth Beanie Helmet Lining Headphones - (52095) Bluetooth Ver V3.0 +EDR; Compatible with all Smartphones and other Bluetooth devices Built in rechargeable Li-Ion battery provides up to 6 hours of playtime, up to 60 hours on standby (USB charging cable included) Wireless range up to 33 feet, built-in microphone allowing you to talk hands free, and simple 3-button multi-function interface provides signal to source device to carry out desired action One Size Fits Most; Hand washable after removing headphones About 2.5 hours on full charge