The CTEK CS One has been designed to be the easiest to use battery charger and conditioner. Simply connect to your battery and the CS One does the rest. It recognises the type and condition of the battery it has been connected to and selects a custom charging program to suit. Polarity free connection means you don't even need to worry about which clamp goes where.The easiest battery charger you will ever useAPTO adaptive charging automatically delivers the best charging program to suit the battery type and conditionPolarity free connection. It really doesn't matter which way you connect the leadsBluetooth connectivity to devises with a free CTEK app which enables different modes to be selected and allows you to monitor the charging volts and ampsCan be left connected to a battery for long periods for maintenance charging, ideal for vehicles in storageSuitable for 12v Lead acid, AGM, Gel and Lithium type batteries from 3Ah to 180 AhThe CTEK CS One battery charger and conditioner is blue