Small in size but big on performance, the Coleman Aktiv Sounds CBT40 delivers up to 4 hours of your favorite tunes and has a built-in lithium-ion rechargeable battery so you can continue the party after a quick refresh! Features Bluetooth connectivity for easy music streaming from any compatible device. Dual 5 watt speakers (10 watts total) provide a crystal clear listening experience. It's rugged, waterproof exterior makes it extra durable and perfect for both indoor and outdoor settings!