SP-i160 Portable Speaker. 360-degree sound field. Adjustable design to expand sound field. Easy power on/off control. 1.25" metal driver. Mini jack converter for other audio devices. Quick charge by USB. Built-in lithium battery. Up to eight hours working time. Pouch for storage. Best portable choice for notebook, iPod, MP3/MP4 player or photo frame. Frequency Response 80 Hz 23K Hz. Signal-to-noise ratio 80 dB. LED Indictor -- Power On: Blue, Charging: Red