The SunSaver is a very reliable small charge controller. Constant voltage pulse width modulation charging is a proven advance compared to the common on/off PV regulators. SunSavers are modifiable for sealed or flooded batteries. A rugged anodized aluminum case and epoxy encapsulated electronics enhance durability and longevity. A temperature compensation sensor in the charge controller varies full charge voltage with temperature. May be used in parallel for higher current. They have LED charging and load control indicators in Low Voltage Disconnect (LVD) models. 5-year warranty. Made in the USA. Dimensions: 6" x 2.2" x 1.3"