True online UPS, high frequency,single phase,LED or LCD,RS232 & USB ( ... 5A charger Name: high frequency true online UPS(1-3KVA), UL CertificateUL Number: E337869Main Features:Online double conversionHigh input power factorWide input ... and USB(External SNMP adapter is optional) High Frequency true online UPS KR11 Series (1KVA-3KVA)