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The SmartBlinky models provide the brightest and most effective electrolyte level indication of any battery watering monitor system, so you know when to fill your batteries, keeping them in prime condition. The SmartBlinky Pro model LED is mounted on the battery cable near the connector for maximum visibility, perfect for applications where the battery never leaves the truck such as fast and opportunity charging. The SmartBlinky Pro model features a visual and audible alarm when water levels are low.