Vandesail premium stereo Bluetooth speaker The wireless speaker offers perfect sound quality with the latest Bluetooth 4.0 technology. Multifunctional integrated design, so that you can enjoy the music anytime and anywhere at home, outdoor travel, even party with the perfect sound quality. Bluetooth 4.0, booming bass Bluetooth 4.0, strong double bass and powerful treble, free to play the music you love. 8-Hour play time Built in 2000mAh capacity Lithium battery, working time up to 8 hours, more long life. Specifications: Bluetooth Version: V4.0 Compatible with under V4.0 ) material: aluminum alloy Bluetooth range: 15M rated power: 10W audio interface: 3.5mm audio sound system: 2 Channel charging time: 4-6 hours function: support Bluetooth calling, in, USB, TF card, line please refer to the user manual for detailed usage) color: black, Silver speaker 158 x 45 x 64mm(6.2 x 1.8 x 2.5 inch) weight: 350g(0.77lb) Package included: 1 x Bluetooth speaker 1 x 3.5mm jack audio cable 1 x Micro data/ charging cable 1 x user Manuel 1 x package box Note: no need to charge full for the first time using, recommend to use the output voltage 5V/1000mA charging equipment, in case damage the speaker. Lithium battery is charged at least once a month, in case it over discharge, reduce the battery life. Warning: do not let the rain drop in or splashing any liquid(not waterproof). do not close to the high temperature or heat source.