A practical combination of quick connector and indicator for those with batteries that are difficult to access. The ""traffic light"" indicator shows the battery s charge level simply and clearly. Simply plugs directly into the vehicles cigar lighter / accessory socket.Clearly shows the state of charge in the vehicles batteryAllows for simple connection of a CTEK XS or MXS battery charger / conditionerPlugs directly into the vehicles cigar lighter / accessory socket for ease of useThe CTEK Comfort Indicator uses a simple 'traffic light' system to show the state of charge of your battery. A flashing green light shows that the battery does not require charging. Orange means the battery should be charged to avoid harmful acid stratification. A red light warns that the battery is discharged to a point where sulphation (the main battery killer) is occurring and also that the vehicle may be in danger of not starting.Should charging be required the cap can be removed from the unit and a compa