Output: rms 3w x 2 Frequency response: 100hz to 18khz Signal and noise radio of power amplifier: í²75db Impedance: 2 x 2/4 ohms Material: wooden Built-in lithium battery: 3.7v, 500ma Charging voltage: 5v ía0.5v dc/300ma Accessories: usb cable, audio cable and control keyboard Supports sd/mmc card, mobile and usb drive Connects 3.5mm stereo audio cable to the socket of line-in, you can play music sources from mobile phone, mp3, mp4, pc and other audio devices Available power supply: dc, usb and battery Portable size and suitable for indoor, outdoor and traveling to enjoy the music