The electric arc generator toy can exercise you practical ability. It is simple design but practical in use, bringing much convenience to you. This scientific electric arc generator toy is a good gift for friends and son. Features -Color:Multi -Material:Plastic -Size:7.90X4.00X0.10cm/3.10X1.57X0.04in -Size:6.00X2.00X2.00cm/2.36X0.79X0.79in -Power input: DC 15-24vV -Current: 2A -Pin header: DC5.5 -Audio input: 3.5 jack -Note:Do not put mobile phones, mp3 and other electronic devices close to the coil. -Only in small size, but with shocking energy. Turn the sound slowly to avoid being shocked by the large sound of the arc. -With circuit protection design, will not damage the input device, can play better quality than arc loudspeaker. -This product is safe, low power, will not be injured, but it is not recommended to touch the arc on the top of the coil, there will be a burning sensation. -You only need to the discharge needle, turn down the power, frequency, and plug in the power supply, you in front of your eyes. -It's funny to see people's looks and reactions when the music coil model works like charm. Package list: 4 x set of music coil