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 welded.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.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.Bluetooth Operation:Turn on the Bluetooth of the mobile phone, the device directly, find "XC046" and click connect. After disconnecting Bluetooth, it will automatically switch to U disk.Power amplifier size: 106x66x60mmChannel output: 2 channelsOutput power: 3w+3wPower supply voltage: DC 4.2-5v voltage 5v exceeding 5v will damage the moduleRated current: 1.5A-2A.Material: Plastic+metalcolour: As shownPackage Contents:1 x DIY Electronic KitOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.