The OP-MEN 99810 is a GbE managed switch, it supports 8-Port GbE copper with RJ45 and 2-Port GbE fiber with SFP, and supports redundant power circuitry. The main power inlet is 100~240VAC, the alternate power is a 12VDC battery; the battery is connected on DC terminal block connector. When AC input power is good, the OP-MEN 99810 provides 15VDC output to charge the connected on DC terminal block battery. When AC input power failed, the 12VDC battery will be an alternate power to provide 12VDC power.