CTEK's comfort indicator eyelet is a practical combination of quick connector and an indicator. Easily connects to batteries which are often difficult to gain access to and is great for multi-vehicle use. The indicator shows the battery's charge level simply and clearly with the 3 different colored LEDs. Red indicates a charge less than 60 percentage, yellow is a charge above 60 percentage but fewer than 80 percentage and the green light indicates a charge over 80 percentage. The comfort indicator eyelet comes standard with an end cap attached to ensure the connection stays in good condition while not in use.