Sony SRS-T88 Personal Travel Speakers SRST88 Compact, foldable design - for easy carrying wherever you take your personal stereo Remarkable sound quality from speakers only about the size of a CD case Total 4W power output - provides abundant volume for exciting, wide-range stereo sound Dynamic sound duct - utilizes space within the speaker cabinet plus additional space within the battery compartment to maximize enhancement of low frequency output for powerful bass reproduction World voltage (100V - 240V) adapter supplied - take along these speakers on any overseas trip without worrying about batteries Neodymium magnets - produce great energy output for greater speaker movement, power, and sound accuracy Magnetically shielded speakers - will not disturb picture quality and may be used next to a TV, laptop computer or monitor without interference 2-way power supply - permits speaker operation using "AA" x 4 batteries or supplied world voltage adapter Sensitivity: 80dB/W/m Stereo mini jack; direct Input Jack Full Range Bass Reflex 4W (2W + 2W) Output Power Frequency Level: 100 - 20kHz Approx .4m Cord Headphone Out Type: AC Power Adaptor, DC (Battery (4 x AA) Speaker Unit: 34mm Neodymium Magnet Thin Unit 8 ohms Impedance Supplied Accessories: World type AC Adapter, Connecting cord (50cm), Pouch Dimensions Folded: 5 5/8" x 5" x 1 1/8" (127 x 143 x 29mm) Open: 8 3/4" x 5" x 4 19/32" (221 x 127 x 117mm) Weight - L&R speakers: 9 oz (260g) w/out batteries 12 oz (350g) w/batteries