Product Description What a marvelous little thing is this Tesla coil! It is a wonderful conversation piece. It's also a cool piece of art even just stands on your desk. Warning: 1. Not suitable for people with electronic medical devices. 2. Tesla coil will interfere with electronic products when working, which is the characteristic of Tesla coil itself. Therefore, please don't let your phone get close to the Tesla coil to avoid damage. 3. Please do not use this Tesla under environment with flammable and explosive materials or closed coil and big size metal. Key Features: Spark Interest In Science: It's smart device of wireless transmission experiment. It's absolutely a magic for kids even for adults, they will become fascinated for this Tesla coil. High Safety: The arc of the wireless transmission experiment model can be touched at will, with only a slight feeling and temperature, don't worry, use it with confidence. Specifications: Product Name: Bluetooth Music Tesla Coil Material: Acrylic Color: As Shown Size: 90 x 90 x 33 mm / 3.5 x 3.5 x 1.3 inch Arc length: 0-8 cm / 0-3.1 inch