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The Grandmax Tweakers 2.1 Channel Speakers is a single unit USB or battery powered portable speaker with 2.1 Audio Channels to take Home Theater Experience anywhere on the go. The speaker has 2.1 Channels - left stereo, right stereo and subwoofer, that deliver exceptional sound quality for portable speakers. The speaker is dual power capable. It can use 4xAAA batteries (sold separately), or via a standard USB port, eliminating the need for bulky power adapters.