Description: This music tesla has the function of wireless transmission and loudspeaker, can light gaseous tube and kind of bubbles. It is a perfect teaching tool to spark students' interest of science, also a great gift. It is a smart device for wireless transmission experiments. It can be used to create high voltage and do various scientific experiments, such as wireless power transmission, wireless lighting, and insulator withstand voltage test. This music tesla has circuit protection design, will not damage the input device, can play music better quality than normal arc loudspeaker. Specification: Material: Metal Size Chart: 9.6cmx9.6cmx3.3cm/3.54inchx3.54inchx1.30inch Package Includes: 1 Piece Music Tesla Coil 1 Piece Discharge Needle 1 Piece Electric Pin 1 Piece US Power Adapter 2 Pieces Ambient Light Note: 1.This is not infant toy, please take away from children to avoid eating. 2.Please allow slightly errors due to manual measurement and different monitors.