Item Type: Artificial Lightning GeneratorMaterial: ABS, PCBColor: BlueHost Size: Approx. 98 x 98 x 32mm / 3.9 x 3.9 x 1.3inVoltage: 100-240VPower: 0-100WBluetooth Name: MH M18Mode: Music mode, Lightning modeSupport Music: Square wave music .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; } 1[DUAL MODE] This coil has music, lightning mode, turn the knob on the coil can adjust the length and frequency of the flash. 2[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 lightning will flash to the rhythm of the music. 3[ARTIFICIAL LIGHTNING] The coil can emit about 10 cm of lightning, the arc length can be adjusted by 0 to 10 cm knob, it is very amazing, when you touch the lightning, which is like a tickling massage on your hand. 4[CIRCUIT PROTECTION] This coil has circuit protection design, will not damage the input device, do not worry about safety issues, some heat is normal. 5[PERFECT GIFT] This coil is the perfect teaching tool to stimulate students' interest in science and can be a wonderful gift for your family and friends to experience lightning in the palm of your hand.