Bluetooth speaker combines speaker and power bank to meet all your needs. As a speaker, high definition dual track with 10W big louderspeaker brings you vigorous bass and loud high-pitched music. Work as a power bank, it can supply power for your mobile devices when charging needed. Portable size allows you to put in the pocket or take it outside. Specification: Model: BT205 Bluetooth Version: Bluetooth 4.2 Microphone sensitivity: -38db Speakers size: φ36mm Speaker impedance: 4 ohm Output: 5W *2 Frequency Response: 180Hz-18KHz Bluetooth Communication Range: 10M (without obstacles) Power Supply: Built-in 3.7V 2500mAh Lithium Battery Charging time : about 4 hours , Micro USB port, DC 5V==1000mA (first time please extend charging time) Music Playing time: 12 hours (Moderate volume) Material：silica gel, ABS plastic, Aluminum mesh, Leather Color: Black, White(Optional) Item Size: Approx. 14.5 * 6.7 * 1.5cm / 5.71 * 2.64 * 0.59in Item Weight: Approx. 212g / 4.46oz Package Size: Approx. 17.2 * 10 * 4.4cm / 6.77 * 3.93 * 1.73in Package Weight: Approx. 343g / 12.09oz Package List: 1 * Speaker 1 * Charging Cable 1 * User Manual