Will this work in all vent types?

Most modern dash vents have vertical or horizontal slats that accept clip-on fresheners. If your vents are older or have an unusual design, test-fit the clip first — you want it to grip firmly without cracking the vent.

How long does the scent last?

The 5.12 OZ capacity typically lasts several weeks depending on how often you run your AC and cabin airflow strength. Refresh it when fragrance fades.

Can I refill this or do I need to replace the whole unit?

The tumbler design is a single-use unit — once the liquid is depleted, replace it with a fresh one. Refilling isn't recommended and may damage the rotation mechanism.