DOSS IPX 4 Wireless Waterproof Bluetooth 4.0 Portable Sport Speaker - Gray Portable wireless Bluetooth speaker - whether you're partying,walking out,camping,hiking,biking,or other outdoor activities,enjoy a full-range stereo sound and an impressive bass Bluetooth 4.0 Technology - Connect with any Bluetooth-enabled device (Backwards Compatible to Bluetooth 2.1). Speaker automatically reconnects to the last device used Waterproof Shockproof Dust-proof - Its durable and waterproof silicone housing & port cover protects itself 100% against splash water and dust, making it perfect for both outdoor and indoor use Superior sound quality - Enjoy your music in full-bodied stereo realized through dual high-performance drivers (5W x 2) and an unique bass passive radiator Long playtime - Built-in Li-Ion 1200 mAh rechargeable battery guarantees up to 8 hours playtime. Recharge in just 2-3 hours with included micro USB cable