You no longer have to compromise performance in your portable audio experience. The Diamond Mini Rockers are a pocket sized power house. Combined with Bluetooth wireless streaming a built in patented retractable cable system is also included for your wired audio devices. Wireless or wired. You don't have to worry about carrying extra pieces or cords getting tangled. These portable mini speakers magnetically fasten together and are only 2"x4", making it the perfect size for quality sound on the go. Each speaker twists open to expand for extra resonant bass. The MSPBT200's lithium batteries are fully rechargeable through the included USB Y-cable. One charge provides six to eight hours of playing time. Perfect for MP3 players, smartphones, portable CD players, net books, laptops, and desktop computers, the Diamond Mini Power speakers come equipped with a standard 3.5mm headphone port for easy plug and play.