Feature 
UPS-SL backup intelligent type uninterrupted power supply ( Square wave output)has RS232 interface to PC. Which is installed with our special software to monitor the UPS-SL operation. If the battery voltage is low to critical level. ) The PC will make count-down indication and run the processing programming for the UPS-SL, that is counting down to zero, store date automatically and shut down the UPS and PC. So, the UPS-SL features high reliability with the function of dealing with unexpected power off and shut down processing. If really is a ideal power supply for computers & peripheral electronic Equipments. 
Function 
CPU microprocessor control, monitor the UPS and battery state automatically 
Power management software, graphical display 
AVR high accurate and full voltage and frequency stabilization, wide voltage range 
Soft start, and distinguish the frequency of power network automatically (50/60Hz) 
Perfect protection function (over-voltage, under-voltage, over-load, short circuit, battery low limit) 
Intelligent battery control and computer communication function 
Intelligent sound indication and LCD display.