Advanced protection for reliable operation: This amplifier board includes short circuit, overcurrent, overheating, and antireverse connection protection. These safeguards help prevent damage and ensure consistent performance under a variety of conditions. Flexible inputs and easy switching: Supports Bluetooth 5.0 for efficient, longrange wireless connectivity up to 49 feet, and a 3.5 mm AUX input for traditional wired audio sources. Seamlessly switch between inputs to match your source and listening situation. sound with strong performance: A 2.1 channel amplifier with treble and bass adjustment knobs allows precise tone shaping for quality, layered sound and impactful bass. Maximum output is 2x50W 100W, enabling clear, powerful audio across a range of speakers. Broad compatibility and practical use: Compatible with Bluetooth enabled devices and analog audio sources via AUX. Suitable for DIY audio projects, upgrading existing stereo systems, or building compact home or smallvenue setups. Use scenarios: 1) Home stereo upgrade: Connect a phone or tablet via Bluetooth, run the system through the speaker pair, and finetune treble and bass to suit the room. 2) PC or media center enhancement: Use the AUX input for a desktop or media PC, delivering richer sound for games and movies. 3) DIY speaker build or small venue setup: Integrate the amplifier board into a custom cabinet or portable sound system to achieve a robust 2.1 channel output with adjustable tone controls.