This music has the functions of wireless power transmission and speaker, which can gas pipes and . It is a perfect teaching tool to stimulate students' interest in science and a great gift. Therefore, coil has become a multi-functional artwork with high playability, good viewing and practical science education. Long arc mode and music mode: Long arc mode releases- at a fixed frequency. Turn the knob to medium power, you can touch the- with your hand, you feel a little stinging, and it be particularly powerful in front of your friends. Music mode, connected to the device through Bluetooth, playing square wave music, and -energy is concentrated in the cluster. It is small enough, adopts more complicated circuit design and upgrades a larger top booster coil area, but it has shocking energy. Turn the sound slowly to avoid the big impact of the arc sound. The optimized coil -arc is long and thick. Upgrade: Bluetooth connection is more stable! The self-developed Bluetooth chip can adapt to all mobile phones, computers and other Bluetooth devices. Better coil technology! It is covered with gold-plated and transparent ink, which has better dustproof ability and higher stability. The operation is convenient and simple. Just tighten the discharge needle, turn off the power supply and frequency, and plug in the power supply. You can see the- in front of you, switch to the music equipment, use 122 square wave music USB memory sticks, and support Type-C. You don't need to download it to your mobile phone, just insert a USB memory stick. Let- follow the rhythm of music. Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on. Voltage:AC220V Colour:Black Material:Acrylic Package Contents: 1 * coil speaker 1 * power adapter 1 * discharge needle 2 * atmosphere lamp Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.