Wireless Headphones Earphones Headset (730-BB) Built-in Apt-x Technology Reproduces Cd Quality Sound Over A Bluetooth Connection Delivers Enhanced Audio & Bass Response. "Sweat-proof : the material of the headset is in a sweat design, do not dip it in the water / Exercise-proof : Very comfortable and secure in the ears " "Talk/Playing Time : 4 hours / Standby Time : 100 hours (Please use the USB charge cable to charge it first..) " "Comfortable Design : The flexible, bendable, neckband style ensures a 100% comfortable fit. "