Compatible Model - Headlight compatible with 2023 Trailblazer ACTIV, LS, LT, RS 1.2L L3 , 1.3L L3 Headlight compatible with 2022 Trailblazer ACTIV, L, LS, LT, RS 1.2L L3, 1.3L L3 Headlight compatible with 2021 Trailblazer ACTIV, L, LS, LT, RS 1.2L L3, 1.3L L3 Function - 1. Halogen headlights have better light penetration ability in foggy, sunny and rainy conditions 2. Daytime running lights provide the best lighting effect for drivers during the day, enhancing visibility while driving Note- Make sure to check the model of the car before purchasing to avoid any incompatibility issues with the product.