Features: This is a multi-functional small coil, coil can produce a high frequency and high voltage electric field, and through the discharge end to generate arc. High-frequency and high-voltage electric field can excite some lamp containing gas, so that the lamp can light up, which is to light the lamp separately from the for sky. This coil adds audio modulation to the circuit, so when a music signal is input, the arc will emit music sound and become a plasma loudspeaker. The top of this coil is designed with different discharge terminals which can be replaced, thus achieving the effect of ion wreath of ion windmill. Durable and long service life. Specifications: Size: 20x14x7cm/7.87x5.51x2.75inches Package Includes: 1 Set of Coil note: Two specifications：US/EU for Shell not included. Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid.