All parts need to be installed by yourself. The outer cover is transparent if the paper is torn off. The entire Bluetooth speaker kit is equipped with a USB power cord, and the Bluetooth circuit board is well welded.<br> You only need to connect the cable and the sound control board. The power supply can be powered by a mobile phone charger or a computer 5V power supply. The sound quality is better when using a 2A power supply.<br> Function: 3.7-5V DC power supply to automatically , 3W+3W stereo power amplifier, support Bluetooth, support power-off memory, U disk to , can be powered by a power bank.<br> Bluetooth Operation:<br> Turn on the Bluetooth of the mobile phone, scan the device directly, find "XC046" and click connect. After disconnecting Bluetooth, it will automatically switch to U disk.<br> Power amplifier size: 106x66x60mm<br> Channel output: 2 channels<br> Output power: 3w+3w<br> Power supply voltage: DC 4.2-5v voltage 5v exceeding 5v will damage the module<br> Rated current: 1.5A-2A.<br> Material: Plastic+metal<br> colour: As shown<br> Package Contents:<br> 1 x DIY Electronic Kit<br> Only the above package content, other products are not included.<br> 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.