3-in-1 Device: Combines a battery charger, maintainer, and desulfator Boost Battery Health: The Schumacher Pro SPR1628 features multi-stage charging and float mode monitoring for maintaining optimum battery health and extended battery life Advanced Charging Algorithm: Multi-stage charging employs an advanced charging algorithm to maximize battery charge, battery health, and the lifespan of your battery Float Mode Monitoring: While in float mode, the SPR1628 battery charger delivers a small current when necessary to keep the battery fully charged Auto Voltage Detection: The Schumacher Pro SPR1628 automatically detects the voltage of connected 6-volt and 12-volt batteries, for easy, worry-free charging Maintain Stored Batteries: Keep stored or infrequently used batteries fully charged and in top condition with the Schumacher Pro SPR1628 battery maintainer Reverse Hook-Up Protection: With built-in advanced reverse hook-up protection, the charger protects against damage if the clamps are not properly connected Works With Common Battery Types: The Schumacher Pro SPR1628 Fully Automatic Battery Maintainer is compatible with 6-volt and 12-volt standard and AGM batteries In the Box: With your purchase, you will receive the Schumacher Pro SPR1628 8-Amp/2-Amp 6-Volt/12-Volt Fully Automatic Battery Charger and Maintainer and user manual