UE BOOM Wireless Bluetooth Spaker - Yellow/Green 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. Easy pairing via NFC for NFC-enabled devices Double Up: Wirelessly connect two UE BOOMs together in stereo via the UE BOOM app to spread the sound and pump up the volume The rechargeable battery has 15 hours of playback.Lithium Batteries are included, they are built into the device and are non-removable