Altronix AL300ULXR Power Supply-Charger converts a 115 VAC/60Hz input into one (1) class 2-rated 12VDC or 24VDC power limited output. It has a 2.5 amp supply current and class 2-rated power limited output. Maximum charge current is .7 amp. It automatically switches over to stand-by battery when AC fails (zero voltage drop).