This bulb is compatible for both CK/SRCK and standard socket, Non-polarity design. Best value in the market! Features Dual Brightness: The Dim mode is Tail lights or DRL, while the Bright mode is Brake/Turn Signal lights or Back Up Reverse lights. The bulb run in Bright mode when your bulb only function in one mode. High Brightness LED: 54SMD 3014 chipset 3SMD 3030 chipset. Working Voltage: 9-30V (fit 12V, 24V vehicles). Output Wattage: 3.8W/bulb (Low Power Consumption). Color: Xenon White 6500K. Waterproof: IP65. Service Life: Up to 30,000 Hours. Note: You will need load resistor or flash relay to prevent the hyper flash when replacement for Turn Signal Lights. How to find a correct size bulb 1?If you have a stock halogen bulb, you can refer the correct part number to find out the correct bulb. 2?If you don't have halogen bulb, please enter the year/made/model of your vehicle to the fitment guide, it will tell you which bulb can work for you. 3?The "Note/!" is very important, it will tell you the applicable position, pls refer to it when using the fitment. For example, "Note: Fit for Brake/Front Signal/Rean Turn Signal/Tail light.", it means the led bulbs only fit for these lights, if you want a reverse light, the led bulbs won't fit. 4?Any other problem please feel free to contact us, we are always here to satisfy of you. iBrightstar is a registered brand with Amazon. Please contact us if there is any questions or other requests! Set of 2 Bulbs 54SMD 3014 3SMD 3030 high brightness chips per bulb, Working Voltage 9v30v fit 12V, 24V vehicles. Fits 7440A 7440NA 7440 7440SV 7443NA 7441 7443 7443R 7444 992 WY21W W215W W21W etc. Easy installation, plug and play. Application Back Up Reverse Lights, Tail Brake Lights, Turn Signal Lights, Tail Lights, Parking Lights, Side Marker Lights, Daytime Running Lights etc. Load resistor or flash relay might be needed to prevent the hyper flash or system error. Advantage Nonpolarity design, more than 300 brighter than original halogen bulb, full Aluminum Housing with Projection lens for Maximum Light output and better heat distribution, built in Constant Current IC for Longer life span Low Power Consumption. Please double check owners manual or original bulb number to confirm before placing an order. Any other problem please feel free to contact us, we are always here to satisfy of you. New design launched in 2019, US Patent number USD908272S