Highlights: Own a cool Batman style portable mini speaker Listen to your favorite music songs Compatible with Apple iPhone 4, iPhone 2G/3G/3GS, iPod Nano/ Touch/ Classic/ Video, iPad, cell phones, MP3 player & laptop Can be Charged by PC/laptop's USB (Universal Serial Bus) port (LED indicator will turn to green color when fully charged) Power on/off switch Specification: Weight: 0.04kg Dimension: 8x 4.5x 4.5cm Output: 2.4W RMS (The output volume is around 2 times louder than iPhone's original speaker per our testing) Built-in 500m Ah rechargeable Li-on battery (play for around 4 hours) Package Contents:1x 3.5mm stereo audio cable 1x USB charge cable