POLY BackBeat FIT 505 Headset Head-band Sports Black Binaural Digital Whether youre warming up or winding down move freely with BackBeat FIT 500 Series wireless sport headphones. Enjoy deep rich sound sweat-resistant nano-coating by P2i and a lightweight design for comfortable wearing all day. Listen more charge less From the locker room to the lecture hall youre always on the move. Listen for up to 18 hours on a single charge then use DeepSleep mode to conserve power when your headphones arent in use. Cant find a place to recharge? Listen uninterrupted with the 3.5 mm backup jack. Sweat it out Constantly on the move? P2i military-grade nano-coating protects the headphones against sweat moisture and spills so theyre durable enough to withstand rainy commutes and gym sessions. Bring your music to life Don't just hear your favorite tracks feel them. 40 mm drivers and advanced acoustic technology deliver audio balance and deep rich sound whether youre hitting the weights or the books.