Can I use both scents at the same time or do I have to pick one?

Both chambers work at once. Place one in the cabin and one in the trunk, or position them in separate areas of the interior—each releases fragrance independently so you get dual-zone scent control without the smells mixing.

How long does the gel last before I need to replace it?

Gel fresheners typically run for several weeks depending on cabin temperature and air circulation. Once fragrance fades, you can replace the spent chamber or grab a new Fresh Box Duo.

Do these stick to the dashboard or do they need a mount?

Mounting method is not specified—test-fit your placement (cup holder, under seat, door pocket) before committing. Most drivers place them flat on surfaces without adhesive.