RunPhones Wireless Headphones (Swift Black, Large) Large headband fits hat sizes 7-1/2 and up (23.5 - 25 inches) Superior sound with eco-friendly, lead-free electronics Ultra-thin, padded and removable internal stereo headphone system Bluetooth-enabled headphones sync/stream from any Bluetooth device Rechargeable via micro-USB cable (included) with 8-12 hours of battery life