Each is a mere 3 1/2 x 2 1/8 x 7/8', 3 ozs.... but they'll floor any attacking creep with an immobilizing 'zap,' in just a half-second. Extreme high-voltage powerful, using just 3 lithium batteries (included). Easy, safe to use, with on / off switch, safety button and LED 'ready' indicator. Comfortable contour grip. Nylon holster. Comes in 350, 650, and 950 volt.