Get great quality sound and solid bass response with this High Performance Portable Speaker from Monoprice! This speaker is designed for performance durability and style. It features a built-in rechargeable battery so it is ready to rock whenever you"re on the road. It comes with an attached 3.5 mm stereo plug on the end of a 3 3/4" cord which wraps into a groove on the bottom. A pass-through 3.5 mm jack allows multiple units to be daisy chained for room-filling sound! When closed the speaker measures about 2 3/4" square at the base and about 1 3/4" tall. When opened it extends to about 2 3/8" tall. The controls are embedded into the red trim on the corners of the unit and consist of Power on/off Volume + and Volume -. There is a USB mini-B female port in the side of the base to connect to a USB power source for recharging the battery. Tip: Build an excellent pocket-sized stereo speaker setup by pairing this High Performance Portable Speaker with the mini Rechargeable Portable Speaker (Pair) (PID 8594) . The two devices will complement each other well providing rich full-range musical reproduction with excellent stereo separation and placement.