With true double-conversion online UPS design, PowerWalker VFI 1000-3000 T/E LCD provides powerful and overall protection to your sensitive devices. It can accept wide input voltage for harsh environment. It offers full protection for critical devices such as sensitive servers, network/telephone communication systems as well as for industrial applications.The UPS has USB/RS-232 communication card included in the package. It allows communication via USB port (RS-232 is in-built by default). The card can be replaced with NMC Card for control over SNMP protocol.