Feature 1、Interesting Experiment Kit: This music coil supports music arc, hand touch, wireless arc, palm arc, Bluetooth music mode, phone Bluetooth connection, music playback mode, frequency adjustment, etc. 2、High Performance: The music coil has a circuit guard design that will not damage the input device. It can play music of better quality than curved plasma speakers. Simply plug in the power to light up the LED bulb. 3、Simple Operation: No need for Fangbo music, you can search and download online. Supports Bluetooth connection, plug and play, wireless audio cable or grounding. Support power regulation, frequency regulation, and mode switching. 4、Small and Powerful: This Bluetooth music coil supports square wave music and can produce different tones according to different discharge frequencies. Spark gap arcs can also jump with the rhythm of music. 5、Usage: This music coil has wireless transmissing and speaker function, which can light up gas tubes and various light bulbs. It is a perfect teaching tool to inspire students interest in science and also a great gift. Item Type: Music Coil Material: Acrylic Discharge Frequency: 5-45Hz±10% Arc Length: Approx. 0-10cm / 0-3.9in Host Size: Approx. 96 x 96 x 30mm / 3.8 x 3.8 x 1.2in Package List 1 x Music Coil Host 1 x Discharge Needle 1 x Induction Needle 2 x Small Bulbs 1 x Adapter 1 x Bulb Storage Box 1 x User Manual