Upgrade your vehicle's lighting with PNP Series Switch Back LED Replacement Bulbs. These bulbs feature 3030 Diode Technology and a corrosion-proof cover, making them a reliable replacement for your 3157 bulb. Measuring the same size as a halogen bulb, the LED chips are covered by a transparent lens cap, providing 360-degree light emission with 87 percent light transmittance. With a 30000 hour life expectancy and temperature resistance above 120 degrees, these bulbs are a practical and long-lasting solution for your vehicle's lighting needs. Operating at 12 volts DC, these bulbs are a must-have for any car enthusiast.