●Exclusively designed, US patent pending front/rear LED turn signal lights with no load resistors required and plug-and-play installation (no hyper flash) ●ONLY good for front or rear AO (Amber-Off-Amber-Off) type turn signal light use (Cant not be used for both front and rear together) ●Bulb size approx: 0.8 x 0.8 x 2.23 - Powered by 35 pieces of 0.75W each SAMSUNG 3030 type SMD LED chipsets with a gorgeous amber glow, true 21W output, just like OEM 7440 W21W incandescent bulb, but with 3x brighter lighting output (1000 lumen) ●Warning: Replace EITHER the front or the rear turn signal bulbs, but you cant replace both, otherwise you will still get hyper flash; You CANT use it for constant light up such as driving lights, daytime running lights; Even though these LED replacement bulbs will not hyper flash on turn signal lights, but they are still NOT "Error Free" for European cars; There is a protection IC inside, so each turn signal cycle cannot exceed 8 minutes