Bluetooth V2.1 Technology - Enjoy Hands-Free Calls with Built-in Microphone - Connect and Stream Audio from MP3 Players, Smartphones, Tablets, PC, etc. * Compatible with other Bluetooth-Enabled devices - AUX Input allows you to connect your device directly with the included 3.5mm cable * IP-47 Waterproof & Dustproof Construction - Stereo Speaker Sound & Bass Output - Control Volume & Song Selection Wirelessly * Powered by 4 x AA Batteries (not included) - Optional Power: DC 5V USB Cable Included - Battery Life Provides Up to 15 Hour Playing Time * Touch Button Control Operation - Glossy UV Surface Treatment - Fold-Out Stand and Retractable Carry Handle - Dimensions: 7.8"" L x 1.8"" W x 3.5"" H