The wireless car charger comes with FOD function,that can protect your phone from overheat and charge more effective.when there is a foreign object close to the charger,the LED light will flash irregularly to remind you to move foreign away. The air vents work with overheat protection system,can cool the charger in time to prevent the phone from heat,that extend the life of phone battery. The wireless charging pad is equipped with a power button to turn charge off or on,when not need to charge can press button to turn charger off to save car power.