UE BOOM Wireless Bluetooth Speaker - Red Lithium Batteries are included, they are built into the device and are non-removable Make Some Noise: UE BOOM is the 360-degree speaker that drops bold, immersive sound in every direction Up for Anything: UE BOOM has a versatile, go anywhere shape that is designed to be spontaneous Life-Resistant: Colorful acoustic skin with plasma coating makes UE BOOM water and stain resistant Live Wirelessly: Switch songs, adjust volume and take phone calls from up to 50 feet away. The rechargeable battery has 15 hours of playback Double Up: Wirelessly connect two UE BOOMs together in stereo via the UE BOOM app to spread the sound and pump up the volume