All parts require self-assembly. The outer cover is transparent once the protective film is removed. The complete Bluetooth speaker kit includes a USB power cable, and the Bluetooth circuit board is pre-soldered. Simply connect the wires and install the audio control board. Power can be supplied via a mobile phone charger or a computer's 5V output. Optimal sound quality is achieved when using a 2A power source. Features: 3.7-5V DC power input with automatic music playback, 3W+3W stereo amplifier, Bluetooth support, power-off memory function, USB drive music playback, and compatibility with power bank power supply. Bluetooth Instructions: Enable Bluetooth on your mobile device, scan for available devices, select "XC046" to pair. After disconnecting Bluetooth, the device will automatically switch to USB drive mode. Amplifier Dimensions: 106 x 66 x 60mm Output Channels: 2 channels Output Power: 3W + 3W Power Supply Voltage: DC 4.2-5V (do not exceed 5V to avoid damaging the module) Rated Current: 1.5A-2A Material: Plastic and metal Color: As shown in image Package Includes: 1 x DIY Electronic Kit Note: The package includes only the items listed above. Light reflection and display differences may cause slight variations in color between the image and the actual item. Measurement error allowance is +/- 1-3cm.