... functionAdvanced Hybrid System : 4 Outside (CO) lines ;16-port Hybrid Extensions max. 8 Outside (CO) lines, 64-port Extensions1.3S ... Item)By the function,system can monitor all of Co.Lines and Extension Status,also can monitor,program, ... backup supply:24VDC/7AhInstallationStation connectionKey phoneComapany introduction :Shenzhen Cesller Technology Co.,Ltd,our headquarter lies in Canada. It is a hi ...