Power through your workout with Sennheiser's CX SPORT wireless earphones. They're lightweight, sweat and splash resistant, and with high quality sound and Bluetooth connection, your movement is free and unencumbered by cables. Sennheiser sound Thanks to Sennheiser's proprietary speaker system, experience clear, detailed sound with powerful bass. Wireless freedom Be sure of a stable wireless connection and Hi-Fi quality sound with Bluetooth supported by Qualcomm aptX technology. And you can pair them with two devices at the same time. Read more… Comfortable, tough Wear the CX SPORT around the neck or front and find the ideal fit with an adjustable neck band, three sizes of ear fins, and four sizes of ear adapter. And they're splash and sweat-resistant. Battery life The CX SPORT will last for up to six hours of playback off one charge. And you can manage your smart phone calls with ease with a three button mic/remote on the neck band.