ETL CERTIFICATION AND MULTIPLE SAFETY PROTECTION ：NOONE car battery charger has passed the strict ETL certification, and the charger has multiple protections such as spark, reverse polarity, overcharge/overdischarge, overvoltage, overcurrent, overload, overheat, current return, short circuit, and so on. Protect you and your car,SUPER HIGH CONVERSION EFFICIENCY : The 2A/8A/15A battery charger's adopts upgraded high frequency chip, the conversion efficiency is up to 89.3%, which is higher than other battery chargers with 65% conversion efficiency, which means the charging speed will faster than other chargers in the same charging time,ENGINE START AND WINTER MODE : Engine start delivers 25A current helps activating your car battery to start your vehicle in 60 seconds. Winter mode increases the charging voltage by +0.2V based on the original charging voltage, improving battery activity for more thorough charging in low-temperature conditions,METAL CASE AND BUILT-IN COOLING FAN : The NOONE car battery charger's body case is designed with a unique skeletonized carving design, as well as with a high speed cooling fan inside, the reliable cooling system improves the working performance. Its perfect metal casing is impact and drop resistant for better long term storage,LED SCREEN AND 7-STAGE INTELLIGENT CHARGING : With true 7-stage smart charging (desulfurization, soft start, bulk charge, absorption, analysis, repair, float), it optimizes battery life and repairs batteries without overcharging or damaging them. The HD LCD screen allows you to view the charging stage and charging current and voltage, keeping you informed of the charging status,ALL-IN-ONE COMPATIBLE DESIGN : NOONE Battery Maintainer can test, charge and repair all 6/12-volt lead-acid, AGM, Gel, EFB or lithium (LiFeP04) batteries. The automotive battery charger is perfect for the batteries of cars, motorcycles, lawnmowers, ATVs, lawn tractors, SUVs, boats, and etc,THE BRAND NAME YOU CAN TRUST ：NOONE brand chargers come with a 3-year product service. If you have any questions, please feel free to contact us,STEPS FOR SAFE USE ：First connect the plug to the 120V power supply, second select the appropriate (charging voltage, charging current and battery type) according to the battery specifications, and finally connect the clamp to the battery to complete the charging. After use, first unplug the clamp from the battery and then unplug the plug from the 120V power supply