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Be the life of the party with the Goal Zero Rock Out 2 Rechargeable Speaker. Amped up sound, external controls, and weather resistant for excursions and impromptu dance parties. The Rock Out 2 Portable Speaker amplifies tunes from your MP3, phone or laptop for over 20 hours without draining battery power from your device. Compatible with any device that uses an audio output jack. Zip up storage compartment to safely store your device and keep it protected.