Califone Reader Magnetic Card Reader Sturdy Rugged ABS plastic withstands daily classroom use for safety and durability, the READER has a built-in handle for portability and slotted baffles to protect the internal 1/2 Watts 2.5" Round Speaker, which is loud enough for up to 20 people Skid-resistant pads underneath help prevent walking Full speed playback only, Volume Control, 3.5mm headphone jack 120 VAC 50-60Hz with detached wall adapter (included) or 4 "C" Cells (not included) 9" length x 6.5" width x 2.25" height, Unit Weight: 28 oz. with batteries (18 oz. w/o); Shipping Weight 3 lbs.