1. It’s designed for big concert, church, background music, conference and pub etc.2. Delay switch on, over-heat, over-load, over-current, short-circuit protect detection automatically.3. Flow-through ventilation from front to back.4. Dual fans for proper cooling to maintain performance and proper working levels5. Can endure 8ohms and 4ohms loads.6. Sound muted when switch on to protect the amplifier from the noise causedby the strong shock.