Bought new in 2020. The GEN3 is an On-Board Battery Charger for charging and maintaining up to three 12-volt Marine, Starter or Deep-Cycle batteries, smart charging up to 10 amps per battery. It's waterproof, shock and vibration resistant and can be mounted anywhere. The smart featuree monitors battery activity for safe, fast and efficient charging of Wet, Gel, AGM and Maintenance Free batteries without the worry of overcharging. Features: A 3-bank, 30 Amp (10 Amps per bank) onboard battery charger. Charges starter and deep-cycle batteries up to 230Ah. 100% completely sealed and waterproof design rated at IP68. Spark-proof technology and reverse polarity protection. Provides full-charge output even with low-line voltages. Built-in battery desulfator to recover worn-out batteries. Charges 2X faster than most marine battery chargers. Saltwater-tested to combat corrosion. Ignition Protection and meets USCG-33 CFR 183.410 requirements. Paid 325 plus tax. Asking $190. Thanks.