Feature 1、Adjustable Arc Length Music Coil: This music coil features circuit safety design that plays premium square wave music without damaging input devices. When powered and the LED bulb lights up, it exudes charm like an artful decoration. 2、Powerful Coil: Surprisingly powerful despite its small size, it slowly rotates sound to avoid producing loud arcing noises. Before powering, be sure to rotate the two knobs fully counterclockwise to prevent sudden loud sound that may startle you. 3、Easy to Use: The wireless transmission experimental model coil requires no sound connection, simply tighten the discharge needle, adjust power and frequency, then insert to witness a dazzlingly glowing melody. The music coil module can be oriented horizontally or vertically according to your preference, captivating children and adults alike. 4、Compact and Mighty: Supporting square wave music, this music coil is ideal for music coils, generating different tones based on discharge frequency. Sparking arcs can also dance to the rhythm of the music. 5、Wonderful Gift: With wireless transmission and speaker capabilities, this music coil can illuminate gas tubes and various bubbles, making it a perfect educational tool to sparking students' interest in science and a fantastic gift option that will surely impress. Item Type: Music Coil Material: Acrylic Input: AC100-240V 50 60HZ Rated Power: 60W Discharge Frequency: 5-45Hz ±10% (Lightning Mode) Arc: Approx. 0 to 10cm / 0 to 3.94in Package List 1 x Coil Host 1 x Discharge Needle 1 x Induction Needle 4 x Small Bulbs 1 x Glass Tube 1 x Accessories Storage Box 1 x Power Adapter 1 x Manual