The harp electronics kit exploits properties of photoresistors to play melodies with light instead of real strings. When strings are plucked, the corresponding LED lights will , and the middle, low, high three tones can be adjusted by pressing the buttons. At the same time, there are two built-in music( and Song), perfect for Christmas or Birthday gifts. The lyre DIY kit is easy to and the principle is simple. The connection that clearly mapped and labeled on the board. This Electronic DIY kit help you to learn basic electronic and circuit principles, and practice soldering skills enjoyably and your kids, or students, or DIYers. note,this soldering kit requires certain foundation of basic electronic theoretical and welding and hands-on . Is a Electronic Piano Electronic Soldering DIY Kit. It adopts the principle of emission and reception, and simulates strings to control and change music through simulation. the speaker emits the corresponding scale when the is blocked, which is suitable for teaching and entertainment. It is a interesting DIY electronic product which enables users to understand the circuit more clearly and learn soldering skills. Colour:Photo Color Material:plastic Package Contents: 1 x Soldering Practice Kit 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.