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. You only need to connect the cable and assemble 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, scan the device directly, find "XC046" and click connect. After disconnecting Bluetooth, it automatically switch to U disk. Power amplifier size: 106x66x60mm Channel output: 2 channels Output power: 3w+3w Power supply voltage: DC 4.2-5v voltage 5v exceeding 5v damage the module Rated current: 1.5A-2A. Material: Plastic+metal colour: As shown Package Contents: 4 x DIY Electronic 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.