All parts need to be installed by yourself. The outer cover is transparent when the protective film is removed. The complete Bluetooth speaker kit includes a USB power cord, and the Bluetooth circuit board is pre-soldered. You only need to connect the cables and assemble the audio control board. Power can be supplied via a mobile phone charger or a computer USB 5V power source. Improved sound quality is achieved when using a 2A power supply.Function: Operates on 3.7-5V DC input, features a 3W+3W stereo power amplifier, supports Bluetooth connectivity, power-off memory function, playback from USB drive, and can be powered by a power bank.Bluetooth Operation: Turn on the Bluetooth function on your mobile device, scan for available devices, select "XC046" to pair. After disconnecting Bluetooth, the device will automatically switch to USB drive mode.Power 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 damage) Rated Current: 1.5A-2A Material: Plastic and metal Color: As shown in image Package Contents: 1 x DIY Electronic Kit Note: Light reflection and differences in display screens may cause slight variations in color between the product image and the actual item. Measurement tolerance allowed is +/- 1-3cm.