1.Use high-quality materials with guaranteed product quality 2.This is a practical and kit consisting of an - Bluetooth audio module, an 8002 power amplifier chip, and peripheral components. After production, it can be connected to a mobile phone Bluetooth or played through an audio socket for signal transmission 3.The 3.3W speaker has better sound quality under the action of its casing. Transparent shell design, the internal structure at a glance shows a sense of technology and achievement 4.Bluetooth fast connection, automatic reconnection, stable transmission, and lossless playback 5.Widely applicable, it can be used for teaching and training of electronic technology fundamentals and skills, as well as practical training for electronic enthusiasts and beginners, to enhance comprehensive practical abilities Parameters: Working power supply: USB power supply 5V (recommended to use 5V2A fast charging head) Working voltage: 5V Bluetooth operation: After the audio system is powered on, the phone searches for the Bluetooth name - and connects it to When Bluetooth is connected, the indicator light remains on Depending on the batch, the appearance/color of electronic components may be different from the picture, but the function is the same and does not affect use. type: Without Shell Colour: red Material: PCB+electronic components Package Contents: 3 x DIY Bluetooth Speaker 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.