Non-polarity. Can be used for front rear turn signal light, side marker light, blinker light, parking light, daytime running light, brake light, tail light, etc. When these 7443 led amber bulbs are used for turn signal lights or blinker lights, some vehicles may meet canbus issues, such as flicker, hyper flash or error warning, etc, load resistors or flasher relay may be required to solve the issues, you can contact us through Amazon Buyer Message to get help and solutions | Low power and high brightness. 5.5W per 7443 led amber bulb. Only 1/4 energy consumption of original 7440 amber bulb but 4 times brighter. Built in smart IC driver ensure constant current, no radio interference. Plus instant-on capability with zero warm-up time | Unique imitated halogen shape design. Resembling halogen bulb shape design and sequencing 54 pieces 4014-SMD LED chips precisely around the light. Delivering 360° high luminous efficiency with full amber light, easier to be noticed and safer to drive | Small size comparable to OEM bulbs. Fits: 992, 7440, 7440A, 7441, 7443, 7442, 7444, 7444A, W21W, WY21W, 7440NA, 7440NAK, 7444NA,7444NAK, 7443LL, etc. Amazon filter system may not be 100% accurate or up to date, if you are not sure which bulb model fit your vehicle, please check your vehicle owner manual to confirm or ask a question for help | Electroplating process housing. Improves oxidation resistance and produces less heat. High-end styling, matching great in the assembly. Ideal replacement for your halogen 7443 amber bulbs