About this item Long lasting: Bigger heat sink equipped, can works for hours. No security concerns. Better performance: This music tesla has circuit protection design, will not damage the input device, can play music in better quality than arc plasma loudspeaker, no format limitation. Easy operation: No Manual needed at all. PLUG and PLAY! No grounding needed. Endless fun: This misc tesla has the function of wireless transmission and loudspeaker, can light gaseous tube and kind of bubbles, play all kinds of music. It is a perfect teaching tool to spark students’ interest of science, also a great gift. Amazing conversation pieces on your desk: It's funny to see people's looks and reactions when they squeeze a little shot for this tesla coil model. Plug it and light LED bulb up, and then it works like charm. All of your guests want to know what happened, icebreaking success.