pack of 2, built with 3030 and 4014 LED chips on Each bulb with a Vent for Maximum Heat dissipation. Fit: 921 579 906 922 bulb, The LED bulb is slightly bigger compare with original bulb, please double check light fixture space before purchase Output: 540 Lumen each bulb, Total 1080 Lumen, Plug and Play, can use for Backup Reverse Light, Please double check owner manual for the actual bulb size that needed Canbus LED bulb, but for some newer European or US Made car might give out bulb out error message ( the bulb still function normal) please be caution!