LED ‘traffic light’ indicator: with 6mm eyelets, that shows battery charge status simply and clearly - indicating when it's time to charge.. Simple LED display: red light means charge NOW, yellow light means charge SOON, green light means OK! No need for charging.. Eyelet connection: provides a permanent and secure connection for hard-to-reach batteries. Featuring CTEK’s unique CONNECT system, the INDICATOR EYELET M6 provides a quick, secure and easy way to charge your battery.. Durable: designed and tested in Sweden, with hardwearing and flexible cables that are built to last.. Compatible: works with all 12V lead-acid batteries, and with CTEK chargers up to 10A. 2-year warranty.