This musical has the function of wireless transmission and speakers, and can gas tubes and . It's a perfect teaching tool, students' interest in science, and makes a great gift. Long Arc Mode & Music Mode: Long arc mode releases- at a fixed frequency. When the knob is turned to medium power, the- is touchable, but you will only feel a slight sting. Music Mode: Connected to the device via Bluetooth, square wave music can be played, and -energy is concentrated in the cluster. You can see the arc of the coil beating to music and it will present an amazing sparkling melody. It is small enough, only 3.5 x 3.5 x 1.3 inches (about 8.9 x 8.9 x 3.5 x 3.3) Using complex circuit design and upgraded larger top booster coil, the optimized coil is long and thick , has amazing energy. Turn the sound slowly to avoid a big impact from the arc sound. Before turning on, be sure to turn the 2 knobs counterclockwise to avoid a sudden loud noise that scares you. The independently developed Bluetooth chip can adapt to all mobile phones, computers and other Bluetooth devices, making the Bluetooth connection more stable. Type-C is also supported. Features better coil technology, covered in gold-plated clear ink for better dust resistance and greater stability. The wireless transmission experimental model requires no audio cable connection and is simple to operate, just tighten the discharge pin, reduce the power and frequency, plug it in to present stunning sparkling melody. What a wonderful little thing this Coil is! It's a great conversation piece. It's also a cool piece of art that even just stands on your desk. Warn: 1. Not suitable for people using electronic-medical devices. 2. The coil will interfere with electronic products when working. This is a characteristicof the coil itself. Therefore, please do not let your phone close to the coil to avoid damage. 3. Do not use in environments with and materials or enclosed coils and large-sized metals. Main feature: Sparking interest in science: Smart devices for wireless transmission experiments. It's an absolute magic for kids and even for adults they will be by this Coil. High Security: The curvature of the wireless transmission experimental model can be touched at will, and there is no need to worry about the feeling and temperature, so please to use it. Product Name:Bluetooth Music Coil Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on. Voltage:AC100-240V Colour:As Shown Material:Metal Size:90 x 90 x 33 mm/3.5 x 3.5 x 1.3 inches; Arc length:0-8 cm/0-3.1 inches Package Contents: 1 x main unit 1 conductor 1 set x accessories 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.