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 , 3Wand3W 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: 106x66x60mm Channel output: 2 channels Output power: 3wand3w Power supply : DC 4.2-5v 5v exceeding 5v will damage the module Rated current: 1.5A-2A. Material: Plasticandmetal colour: As shown Package Contents: 1 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 a little different from the real thing. The measurement allowed error is 1-3cm.