If you want a precise, fast charger with built-in battery protection, look no further than this On-Board Charger. The digitally controlled charger continually monitors temperature and battery voltage and automatically responds accordingly. The automatic three-stage charging kicks in using amps and voltage information to prevent overcharging and lessen potential battery damage. Automatic Temperature Compensation mode constantly adjusts output voltage based on ambient temperature to protect the battery from overcharging at higher temperatures. Built-in arc protection prevents sparking while connecting it to the battery. LED color-indicator lights display battery status, including: AC power, bulk mode, absorption mode, ready mode and error indicator. Waterproof, shock- and vibration-resistant aluminum has been saltwater-tested against corrosion. Manufacturers three-year warranty. Available: MK-106D, MK-110D, MK-210D, MK-220D, MK-315D, MK-330D, MK-440D, MK-460D. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Chargers.