Enjoy powerful sound and a secure fit while training with these Plantronics BackBeat FIT 6100 wireless headphones. The memory foam on the adjustable sport-fit headband and ear cushions adds comfort for all-day use, while the rechargeable battery offers up to 24 hours of usage time on a single charge. These Plantronics BackBeat FIT 6100 wireless headphones have a 65-foot Bluetooth connectivity range that lets you move away from your mobile device freely.