The perfect add-on to jazz-up your mobile-listening; the TravelSound Notebook 500 is what you've been missing out on if you've been bored listening to tiny built-in notebook speakers. Compact and lightweight, this ingenious 1-piece portable USB powered stereo speaker has 2 premium titanium micro drivers to deliver excellent stereo-sound quality that is wide and precise. Even with the digital amplifiers, the TravelSound Notebook 500 excels with better power efficiency, translating to lesser power consumption that does not drain your battery life. The SnapAttach clip easily fits any notebook frame of up to 0.5" (max) width, providing optimal audio performance within any limited space, a spot-on space-saving setup. Power is supplied either via USB port, 4x"AAA" batteries or Universal power adapter (Sold separately) making this truly portable and convenient. Simply snap it and blast!Three-Way Power -4xAAA batteries(included), USB port(cable included), Universal AC adapter(sold separately)Powered Subwoofer Out option (Powered subwoofer sold separately).Magnetically shielded speaker. Can be placed near a TV or Notebook without causing display interference.Delivers up to 30 hours playback on a single set of 4-AAA size alkaline batteries.Power -2 watts RMS per channel (DC powered) / 0.8 watts RMS per channel (USB powered)Frequency Response -150 Hz ~ 20,000HzWeighs 6.6 ounces without batteries