The ProSportHD features a lightweight, tri-surface heatsink design. This delivers significantly faster charging through optimal cooling, while delivering true rated constant current charging amps during charge mode. Fully automatic multi-stage charging enhances battery performance while extending battery life. *ProMariner Digital Technology *Distributed-On-Demand™ Technology *Heavy Duty Tri-Surface Extruded Heat Sink Design *Expanded LED Display with Completion Status Gauge *Lightweight Design *Auto-Maintain Energy Saver Mode *Fully Automatic 5-Stage Digital Performance Charging *Built-in Quality and Safety *Easy Installation and Operation