The High Powered 3157 Dual Color Switchback Auto Bulbs are a practical and reliable lighting solution for your vehicle. With a white/amber switchback function and 28 LED emitter SMD chips on each bulb, these bulbs provide a bright and efficient lighting experience. The special IC built-in allows for a delay between amber and white, ensuring a smooth transition. With a 30000 hour life expectancy and an operating voltage of 1 to 16 volts DC, these bulbs are built to last. Sold as a pair and fitting most makes and models, these bulbs are a versatile and convenient choice. To prevent hyper flashing or error messages, we recommend installing 6 OM 25 watt load resistors with these bulbs. With an IP 65 rating, these bulbs are designed to withstand various weather conditions.