Description: The mini tesla ring has small body, circuit protection design, more beautiful appearance. Easy operation, no grounding needed, no audio wire connection.Very cool collectible and gifts. Wireless transmission and loudspeaker function, emit lightnings of about 30 cm, the length of the arc can be adjusted to 0-30 cm by the knob. The Bluetooth model can connec phone to play music, and the lightnings will jump with the music. This mini tesla ring is a safe scientific experiment kit, which is very suitable for students and electronic enthusiasts to study and experiment. Specification: Material: metal + electronic components Voltage: 110 V Power: 400 W Working current: 0.1A-2A Product size: 30x13x45cm/11.81x5.12x17.72inch Package Includes: 1*Music Tesla Coil Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful online shopping!