Shake the dice and watch LEDs slowly flash until the last combination is displayed. No push buttons required, just give it a shake. Rolls out slowly and flashes last combination Microprocessor-controlled Auto power-off Specifications power required: 3V-battery (CR2025 or CR2032) (not incl.) dimensions: 1.4 x 1.4 x 1.3" SPECIAL NOTES: The MK150 is a kit of parts containing the PCB and parts.ㅤ Component level assembly required. Tools needed: Low heat soldering iron, resin core solder, clippers and small screw driver.