50W+50W Bluetooth 5.1 Mini Amplifier Board

Stereo amplifier board with rated output of 50 watts per channel. Measures approximately 12.5 × 8.5 × 3.5 cm and weighs around 320 g. Requires stable DC 18–19V power supply rated at ≥3A; using voltages above 21V is discouraged when connecting four speakers, and supplies at 24V or higher risk component damage due to inconsistent regulation. Housing is made of durable plastic with an external-facing aluminium heatsink and open-bottom ventilation for improved heat dispersion. Compatible with Bluetooth 5.1, 3.5mm AUX, USB storage devices (U disk), and USB audio class support. Supports connection to both powered (active) and unpowered (passive) speakers. Volume is adjusted via a smooth-turning 360° rotary encoder with visual LED level indicator and user-selectable brightness (8 levels). Power on/off is activated by pressing and holding for 1 second; playback control includes single-click (play/pause) and double-click (input mode switching: Bluetooth / USB / AUX). Also enables smartphone gesture control (shake-to-skip) and displays U disk file lists directly on interface. Includes comprehensive hardware-level protections: short-circuit, overcurrent, thermal shutdown, and electrostatic discharge resistance — fault conditions trigger internal processor alerts to prevent permanent damage.