Product features This is a practical and kit, which consists of MHM18 Bluetooth audio module, 8002 power amplifier chip, and peripheral components. After the production is completed, it can be connected to the Bluetooth of the mobile phone or input signals through the audio socket for playback. The 3W speaker has better sound quality under the action of the shell. With the transparent shell design, you can see the internal structure at a glance, showing a sense of technology and achievement. It can be used in the teaching and training of electronic technology foundation and skills, electronic enthusiasts, and beginners to enhance the comprehensive practical ability Kit Name: Bluetooth Two-channel Stereo Speaker Production Kit Working power supply: USB power supply 5V (recommended to use 5V2A fast charging head) Working voltage: 5V 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. 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.