DUAL MODE This coil has music, mode, turn the knob on the coil can adjust the length and frequency of the flash. WIRELESS TRANSMISSION The coil's wireless power transmission allows the bulb to shine without any contact, and it can be connected to a cell phone to play special square wave music, and the will flash to the rhythm of the music. CIRCUIT PROTECTION This coil has circuit protection design, will not damage the input device, do not worry about safety issues, some heat is normal. ARTIFICIAL The coil can emit about 10 cm of , the arc length can be adjusted by 0 to 10 cm knob, it is very amazing, when you touch the , which is like a tickling massage on your hand. PERFECT GIFT This coil is the perfect teaching tool to stimulate students' interest in science and can be a wonderful your family and friends to experience in the palm of your hand.