OptiMate 7 SelectOptiMate 7 Select GOLD series: 9-step 12V 10A sealed battery saving charger & maintainer.The ‘PRO choice’ battery charger that gets the full potential out of your high performance 12V battery. Includes power supply to support battery during tuning / troubleshooting.Ideal for 12V engine start (SLI) and deep cycle lead-acid batteriesSelect charge voltage of 14.4V for most batteries or 14.7V for premium AGM batteries, or select Power Supply support mode – Selection remains in memory even if AC power is lost.Power Supply mode provides constant power for vehicle tuning, diagnostics and troubleshooting.Fully automatic multi-step program brings the battery safely to full charge – Connect to the battery and OptiMate 7 Select does the rest, no supervision required!AMPMATIC: Automatically adjusts current to match battery size and condition.Temperature compensation: Voltage is adjusted higher when colder, or lower when hotter.Safe to leave connected. Full electronic protection.24/7 Maintains battery at full charge and good health.Saves your ‘dead’ battery from as low as 0.5V.S.O.H.: Tests battery state of health.Green Technology: 50% less energy, 50% lower cost. Power Factor Correction and Synchronous Rectification.IP54: Weatherproof. Rated for use down to -40°C / -40°F.