Confirm if vehicle charging system is working or battery is charged & provide emergency roadside light, powered via your permanent battery lead or an an optional BIKE / AUTO socket accessory. GREEN LED indicates: vehicle charge voltage is 14V or higher RED LED indicates: battery voltage is less than 12.3V. 6 bright LEDs provide bright light to fix a flat tire or light up hard to see places. Industry standard SAE 2-pin connector. Cable length = 40″ / 100cm. Premium LED product designed by TecMate. 3-year limited warranty.