The Voombox Travel is a 3-inch disc that will fit in the palm of your hand. A 2-inch active driver and 2-inch passive radiator take up a good chunk of that small space, with the rest reserved for the speaker's amplifier and Bluetooth 4.0 chip. For easy carriage, the design of the Voombox-Travel features a built-in loop that is both easy to grip and doubles as a connection point for the included carabiner. This speaker isn't just for the outside either. It features a built-in mic for full speakerphone capabilities. The unit is recharged by USB and has a lithium-ion battery that lasts up to 6 hours. The Voombox Travel has a rugged exterior said to resist water and dust, making it suitable for all sorts of outdoor adventures. And because it is so light, it won't weigh down your pack. Built for the outdoors, the Divoom Voombox-Travel can endure camping, fishing, backpacking and nearly any other activity thrown its way. The weatherproof speaker is equipped with the latest Bluetooth 4.0 technology and connects to smartphones, tablets or any other Bluetooth device up to 10 meters. To ensure the ultimate in sound quality, the Divoom Voombox -Travel features a 2" driver and a 2" passive radiator for impressive bass for its size. In addition, a built-in microphone lets users make and receive calls wirelessly on their own or in a group. The Voombox-Travel's round aesthetic design featuring four colors (red, blue, black and green) means the speaker looks great inside as well as outdoors. Full control of your music directly on the device The Voombox Travel lets you control any incoming phone call or your music directly on the device. Volume +/- , Skip or return to the next music track, receive phone calls Music to go & Splash Resistant Enjoy your music anywhere and share them with friends. Your perfect companion for travel, parties, or any outside activity. Splash resistant design makes it usable in any environment, no matter if indoor or outdoor