BRAND NEW SONY SRST33 Compact Portable Speaker: SRS-T33 Silver Power Supply allows fully portable operation with optional "AAA" x 2 batteries Total Power Output 0.2W provides ample volume for wide-range stereo sound. Mega Bass Stereo Sound: produces more powerful bass tones regardless of volume Compact, Lightweight and Foldable Design for easy carrying wherever you take your personal stereo. Can Also Be Used As Passive Portable Speaker System: with no batteries or external power source required Neodymium Magnets produce great energy output for greater speaker movement, power, and sound accuracy One-Box Stereo Sound maintains separation between speaker cabinets for clear stereo sound