?Long life and extra low reducing brightness. No need to change bulbs frequently. ?Upgrade Advantage: Built-in intelligent IC driver for better performance, stable input current protects the circuit, Ensure the secure temperature range and consistent brightness out to reach a long LED bulb life up to 50,000 hours. ?Important Attention?Polarity Sensitive: If the bulb is not lit after the installation, please simply rotate the bulb 180°and re-install it. Please check your original bulb size and socket type before purchasing to ensure that our 31mm led bulbs can be used in your car.