ProMar1 DS Generation 3 reflects a new outward design taken to the next level in performance with its all-Digital Charging Technology. Fully Automatic with a 4-Stage Digital Charging algorithm proven to extend battery life. Sequential modes of Analyzing, Charging, Conditioning and a built-in Auto Maintain mode, safe for short- and long-term storage periods ensures your batteries are fully charged and maintained. Features: Dual Mode Charge Status Indicator, Battery & Wiring Fault Detection, Rugged Shockproof Construction, Auto Maintain/Energy Save Mode Extends Battery Life, Safe for Long- and Short-Term Storage, Pre-Wired with Waterproof Inline DC Fuses and Nickel-Plated Copper Ring Terminals, Built-in Safety & Quiet EMI Design meets US FCC Emissions Requirements.