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. The eyelet terminals are fitted to the battery, giving effortless connection without the need of actually reaching the battery.The 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 compatible CTEK charger plugged in directly to restore the battery to fully charged status.Eyelet: M6 (6.4mm) or M8 (8.4mm)Cable length: 50 cmFuse: 15A2-year warranty