Features:Interior CPU control.Advanced PWM technology for inverter output. AVR function.LOW current switch control technology to extend the life of the switch.Thermal battery change technology ,convenient for the user's to change battery (DH-500A/B,DH-500CA/CB)Inner enquipped charger of constant current and voltage, Advanced battery management and low voltage protection systemRJ45/11 for telephone, fax and modem circuit protection.Smart RS232 interface for automatic file saving and power-off functions at your computer.Advanced battery management system with automatic re-charging function.Special protection against AC/DC overload and short-circuit protection against inversion state with high reliability
Display by LCD