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.