Get your flashing brew cup here. Hoist up a light up mug of beer. Light up barware; Magic Matt’s got em’. The on/off switch is on the bottom. Height: 4.87 in. , 12.37 cm. Width: (Including Handle) 5.25 in. , 13.33 cm. Diameter of Brim: 3.62 in. , 9.19 cm. Volume: 16 oz. , 500 ml. LED Colors: 2 Blue, 2 Jade, 2 Red Batteries: Includes 4 Replaceable AG13 Batteries. Battery Replacement: 1. Remove base of glass. 2. Remove reflective surface to reveal battery housing. 3. Replace batteries.