Product features: Perfect sound with 3D stereo effect Power supplier by USB, no adaptor amplifier required No need any software driver Full Frequency speaker Continent with USB jack Easy and simple connection with PDA, notebooks, Walkman and other music sources Suitable for use and bedside audio System required: Computer with USB 2.0 or 1.1 Computer with audio output port Various parts of the product description: Speaker Stereo signal cable USB jack Volume controller Specification: Output: 2.5WX2(power supplies by 5V/1A power adaptor) Output: 1.25WX2(power supplies by the computer) Input sensitivity: 600mV Frequency response: 90Hz-20KHz Distortion: <0.3%(1KHz 1W) Signal to noise ratio: >60dB The degree of separation: >45dB Terms and condition: Product is brand new! It is already at its lowest price! No negotiation thank you! Once sold no refund no exchange! You can check the item before purchase! Meet up: Lavender mrt/Farrer park mrt/ Blk 29 Kelantan road. Mailing provided with addtional charges!