Product Review

1.For 12 volts
2.Number of Bulbs: 20PCS
3.LED Color: Ultra Blue
4.LED Type:T10 5050 high power Tri-Cell 5 SMD LED
5.Base Diameter: 9mm
6.Total Height: ~28mm
7.Weight:40g
8.Cross Reference: W5W 194 192 168 175 2825 579 147 152 158 159 161 184 193 259 280 285 447 464 555 558 585 655 656 657 1250 1251 1252 2450 2652 2921 921 906 579
9.Application: Common use for Interior (Map, Dome, Cargo, Courtesy) Light, License Plate Light, Parking Light, Turn Signal Light, Corner Light, Side Marker Light,
Tail Light, and Backup Lights, Common use for Car, Truck, Motorcycle, Scooter, Trailer, RV, Boat, Marine, ect..

Solution:
-European brand cars may have need T10 canbus bulbs to remove error messages.
-Won't light up: Flip it 180 degrees(reverse the polarity). Move the metal pin clips closer so that they can mount the festoon tighter. (You don't have to do that if you think it might break the clips)
-Flicker. Try slightly raise the LED bulbs metal pin and reinsert (improve connectivity)