25 Amp Fully Automatic Battery Charger/Maintainer for Valve-Regulated 16 Volt AGM Batteries, Microprocessor controlled fully automatic automotive charger / maintainer with float mode monitoring, AGM Series for valve regulated 16 Volt batteries, On/off switch and 3 LEDs that signal six separate charging functions. Durable, ventilated, heavy gauge steel case with baked enamel finish, Dependable, solid-state design.

LED Indicators: The battery charger has three LED lights. They indicate different functions.
RED LED - A steady glow indicates POWER ON.
RED LED - flashes if there is a problem. (i.e. battery isn't charged within 8 hours).
YELLOW LED - A steady glow indicates proper connection to the battery.
YELLOW LED - Flashing indicates no connection or reverse connection.
GREEN LED - A steady glow indicates that Float-mode Monitoring is keeping your battery maintained at full charge.
As a safety precaution, after 24-hours of charging, the charger automatically switchs OFF.