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This Bluetooth amplifier board has a bottom plate and a top plate, support reverse connection protection, Over-voltage protection, under-voltage protection, Over-heat protection, Short-circuit protection. With volume control and power switch, Ideal for DIY your passive speakers and home audio system. It adopts copper DC connector and fence type terminal. It can withstand large current, no heat, no damage to the wire. Large-area heat dissipation system, and high-quality power module, it will not overheat and stop work at long-time high output. The speakers interface with separate grids makes the wiring safer and is not prone to short circuits.