This kit consists of - Bluetooth audio module, 2018 power amplifier chip and peripheral components. After the production is completed and connected to the power supply, you can connect the mobile phone Bluetooth to , or you can input the audio signal from the 3.5mm music socket for playback. The 3W speaker has a better sound quality under the transparent shell, and it has a music spectrum melody light circuit. The 5 LEDs can flash with the music melody, which gives people a pleasing feeling, very and interesting. The kit can be used for electronic technology skills teaching and training, and for electronic enthusiasts and beginners. Note: This is a DIY kit and needs to be assembled by yourself. Power supply: USB power cable 5V DC Speaker power: 4 3W mono Different batches may have different components, but it does not affect the use Colour:Transparent Material:PCB+components+acrylic Size: Package Contents: 1 x DIY Bluetooth Speaker Kit with case 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.