Description/Features: The power supply voltage of this motherboard is 5V. High integration, one motherboard realizes most practical functions. The main functions of the motherboard include: audio amplification, power amplifier module, Bluetooth output module, power conversion module, audio output module, headphone output module, switch, volume adjustment, power indicator light, etc. It can directly drive two 4 ohm 3W speakers (speakers need to be equipped separately), or use the audio output module to connect to an external amplifier speaker to provide better listening enjoyment. Specifications: Due to different batches, there may be differences in product appearance and printed text, which will not affect use Material: pcb colour: As Shown Package Contents: 1 x motherboard 3 x cable 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.