The "1.44" in the title indicates it was built or updated for ETS2 game version 1.44 .
Many "Big Lightbox" mods include additional attachment points (slots) for other accessories like beacons, horns, or small LED lights. BIG LIGHTBOX VOLVO FH5 2020 MAERSK 1.0 1.44
Specifically designed for the Volvo FH5 2020 (often referenced as Series 5), which is a popular high-detail truck mod for the game. The "1