Description: Output Power:2.5W*4 Impedance: 8 ohms Frequency response: 100HZ-18KHZ Sensitivity:>38dB Inner power: 3.7V rechargeable Li-ion battery Dimension(L*w*H): 238*192*43MM Unit packing:258*212*68MM Net Weight: 205g Features: *Compatible with all ipod products and mp3/mp4 player * input: Headphone jack /USB dock/ IPOD dock * USB to 3.5mm stereo cord * remote control * Electronic volume control * three key-press:Power, VOL- and VOL+ on the speaker * Rechargeable Li-ion 3.7V battery in the speaker * Build-in subwoofer for heavy bass effect * Green LED power light * Choosen Function: FM Colour Available: Red, Green,Blue,Purple and Siver or at the buyers'option