A. This is a fully automatic battery charger with 7 charge stages B. Automatic charging protects your battery from being overcharged. So you can leave the charger connected to the battery indefinitely C. 7-stage chargers are suitable for most battery types including Calcium, Gel AGM, Wet, LiFePO4, Lead Acid batteries. They may also help restore drained and sulphated batteries D. Specification: E. Switchmode technology: Yes F. Polarity protection: Yes G. Output short protection: Yes H. Non battery link protection: Yes I. Over voltage protection: Yes J. Over temperature protection: Yes K. Cooling: Fan L. Input voltage: 100-240V AC,50-60Hz M. Rated output: 12V 10A,24V 5A N. Minimum start voltage: 5.0V O. Battery range: 6-200Ah P. Thermal protection: 65±5℃ Q. Efficiency: about 85% R. Dimension: 192x102x165mm S. Package included: T. 1 x Car Battery Charger U. 1 x English User Manual