1. It is composed of Bluetooth stereo module, power amplifier chip, music spectrum and other components. 2. It can be connected to Bluetooth to and supports stereo output 3. Equipped with 3.5mm audio signal input port, which supports wired connection to computers, mobile phones and other equipment 4. When the audio cable is plugged in, it automatically switch to the audio cable signal, free from Bluetooth sound interference 5. Music spectrum display, rich colors, beautiful music Product Name: Bluetooth Spectrum Audio Kit Working power supply: USB power supply 5V (recommended to use 5V2A fast charging head) Working voltage: 5V Working current: quiet less than 10mA, full load not less than 500mA This Electronic DIY kit helps you to learn basic electronic knowledge and circuit principles, and practice soldering skills enjoyablely and your kids, or students, or DIYers. Note: Parts need to be welded by yourself Colour:Photo Color Material:plastic Package Contents: 1 x 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.