Bluetooth 5.0 connectivity provides higher transmission efficiency and longer wireless range for stable audio playback from compatible devices. The amplifier board includes protection against overheating, overvoltage, undervoltage, and short circuits to safeguard both the device and connected equipment. Onetouch start/stop operation with a longpress power switch offers simple, convenient power control. The main knob uses a end rotary encoder for 360degree infinite tuning, delivering a smooth and continuous adjustment feel. Key attributes and notes Function: Bluetooth audio streaming with integrated amplifier protection features. Compatibility: Supports Bluetooth 5.0 devices for wireless connection; performance benefits come from the version's efficiencies. Size and materials: Not specified in the available information. Performance: Designed for reliable wireless streaming with multilayer protection to enhance durability and user confidence. Use scenarios DIY Bluetooth speaker or home stereo project: Integrate the amplifier board to enable wireless playback from Bluetooth sources while benefiting from builtin protections and easy control. Car audio installation: Add wireless audio streaming capability and protective features to a vehicle audio system, helping to safeguard components during operation. Compact desk or bookshelf audio setup: Create a small, easytouse system with onetouch power and precise knob control for volume or other adjust functions, suitable for desktop or smallroom environments.