TREBLAB HD7 stands out for its combination of compact size and impressive sound quality. Featuring superior 360°HD surround sound and true stereo effect, HD7 delivers crystal clear, distortion-free, and deep sounding audio. It's powered by a 2,600mAh battery, allowing you to enjoy a superb audio performance for up to 25 hours. Surprisingly compact, you can hang it on a bicycle or put in any bag's cup-holder. HD7 boldly resists heavy sprays of water. Its handy design and durable build quality guarantee longevity. Take your favorite tunes with you wherever you go!