These Sync by 50 Cent on-ear wireless headphones are designed for the athlete who desires the comfort of a wireless connection combined with the quality of audio quality of SMS. The ear cups feature sweatproof material making them resitant to both water and sweat (IPX4 rated). The headphones are ultra-light and offer up to 10 hour of continuous Bluetooth playback with one charge. The on-ear track pad allow you to control music. volume. and answer calls wirelessly.