True online UPS, high frequency,single phase,LED or LCD,RS232 & USB (optional),long back-up model with 5A charger Name: high frequency true online UPS(1-3KVA), UL CertificateUL Number: E337869Main Features:Online double conversionHigh input power factorWide input voltage rangeFull protection functionAutomatic bypassEPO functionHigh reliability and performanceIntelligent RS232, USB communication ...