The BTS30 wireless headphones have been designed specifically to be worn during the most enduring of sporting activities, to deliver premium sound and maximum comfort. The Bluetooth function eliminates cables and thanks to their IPX4 rating - are protected from splashing from water or sweat. Sports Use Design 3D-Flex Sport Clips. Convenient, Multifunctional Water Proof IPX4, Quick Charge. Elastomer ear pieces. Bluetooth wireless cord. In-line volume control. Adjustable headband. 9mm driver. Carry case. Water-resistant. Batteries required 1 x rechargeable battery (included) .