1. Bluetooth Amplifier DIY Kit: This Electronic DIY kit help you to learn basic electronic knowledge and circuit principles, and practice soldering skills enjoyably and your kids, or students, or DIYers. 2. Great Electronic Soldering Project: for soldering practice and also suitable for family education. Not only to improve your soldering skills, you also be more familiar with electronic components and learn more interesting electronics things. But please note,this soldering kit requires certain foundation of basic electronic theoretical knowledge and welding and hands-on ability. 3. Easy Installation: The bluetooth module board is soldered and can be used directly after connection. You only need to solder the Led flashing light kit, connect the wires, and assemble the shell. Fun and entertaining, bluetooth Speaker by yourself, a cool project and challenging enough to be fun. About power: 5V mobile phone charger or computer power supply can be used, the sound quality be better when the current of the power supply is 2A. Product Name:-044 DIY Bluetooth Speaker Kit Supply Voltage:DC 5V As music or other sounds sound, the LED lights flash and move according to the rhythm of the sound. Circuit principle: controlled LED melody light circuit consists of a power supply circuit, a microphone amplification circuit, and an LED luminous indicator circuit. The power supply uses two batteries. The converts the sound signal into an electrical signal, which is coupled by c2 to Q1 for amplification. The amplified signal is sent to U1, where U1 drives the LED to emit light Parts need to be soldering by yourself Colour:As Shown Material:plastic Package Contents: 1 * Electronic Building 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 picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.