Quantity 2 piece(s) Material ABS Color Black Function When you meet the failure as you try to convert your original halogen lamps to LED lights such as the original car halogen lamp is 5W the LED lamp is only 1~3W the trip computer will check out the power does not match this results failure: does not light or flash abnormally; Then you need to install LED decoder to cancel the warning or the hyper flash of the turn signal light etc; LED bulbs may trigger error sensors by different reasons on some vehicles so it may not cancel all the errors for different car Packing List 2 x Decoders (30cm cable)