1. Provide 100V/70V constant voltage output and 4~16Ω constant resistance output; 2. Switch on and off the anti-shock horn, and the fan automatically adjusts the speed; 3. Overload output automatic voltage limit control; 4. 1 group of background music signal input port, 1 group of emergency audio signal input port; 5. Support short circuit and DC-24V strong cut control mode; 6. Temperature protection, overvoltage and overload protection, short circuit protection.