Size: 5 x 2-3/4 x 3/4 inches Plastic battery Box. Holds eight AA batteries giving an output of 12 volts. An excellant power source for those small displays needing 12 volts to light them up. A temperary source for testing or when you do not have a convenient outlet for your transformer. Includes leads with 5.5mm plug to go into power connector (CR2S 701-1) of your dollhouse or display. Due to it's low flat design, it will fit and hide well under the display.