An upgrade in audio performance and features from the original Sound To Go (MP250), the Sound To Go Plus incorporates a built-in rechargeable lithium-ion battery that can hold a charge for up to 10 hours of audio playback. The brushed aluminium shell houses two channel stereo speakers with two 1¼ inch drivers on each channel with a built-in Class-D amplifier and oval passive radiator for bass enhancement. Producing a total of 3 watts RMS, the compact unit is an enhancement over built-in speaker solutions on many computer or mobile devices. This versatile compact system can charge and stream audio from your laptop or PC using the USB cable, or attach to any portable media device using the auxiliary 3.5mm audio connecting cable for multiple audio applications. Small and weighing only 350 grams (12Oz), the Sound To Go Plus is a ideal companion for all audio needs while on the road, for outdoor activities, at home, or at the office.