SAKO PCM series off-line UPS: 1) Double PCB design with boost and buck AVR -25% + 25% 2) High/Low voltage protection, overload/short protection 3) Beeping alarm on battery, battery low and overload 4) Two colored LED display 5) Frequency selection automatically 6) Intelligent battery management 7) Smart RS232 and RJ11 option SAKO PCN-V series line interactive UPS: 1) Microprocessor control guarantees high reliability 2) Equipped with Boost and Buck AVR to stabilize input voltage 3) Built-in DC start function enables UPS to be started up without AC power supplied 4) Smart RS-232 communication port 5) Auto charge even though UPS is off 6) Provides modem/phone line surge protection. 7) Provides discharge, overcharge, and overload protection. 8) LCD display