Whether you’re warming up or winding down, move freely with BackBeat 505 Series wireless sport headphones. Enjoy deep, rich sound, sweat-resistant nano-coating by P2i and a lightweight design for comfortable wearing all day. Key Selling Points:Sweat-resistant protection from P2i military-grade nano-coatingUp to 18 hours of wireless listening and talk time on a single chargeEasy-access on-ear controls for calls and music40 mm drivers and advanced acoustic technology provide deep, rich sound