This high quality Buzz Coil provides a powerful spark. It will operate from a wide?range of DC voltages. A small 9 Volt rechargeable battery pack is commonly?used as a power source. It works just as well when a 12 Volt car battery is used?as the power source. The box measures 4-1/2″ x 2-3/4″ x 3-1/4″ tall and is?constructed from Oak.