Specifications: Model: Tesla coil Output voltage: DC5V Power: 20w Package List: 1 * Tesla coil 1 * Stainless steel ball 1 * Neon Light 1 * OTG Cable Note: 1. Ultra-small size, the USB port can be connected with any 5V power supply. 2. Does not produce an independent air discharge arc, a good conductor near the top can generate an arc of about 1 mm, no electric shock, very safe. 3. It is not necessary to pull the Tesla coil to the coil or the hand when working. Because the hand acts as a good conductor, the coil will form a good loop. For the Tesla coil with a large current, the demonstration effect Change or not. Please note.