V-Air Solid Cool, air freshener cup with mint fragrance, parton Suitable for frequent use. Passive action. Multi-phase fragrance release. The ceramic cup and gel insert emit different scents, and because they evaporate at different intensities, you can smell a continuously changing scent along a fragrance continuum over a 30-60 day lifetime. Eco-friendly design: no propellants or batteries, no electrical units, cartridge is biodegradable (plastic holder is 100% recyclable), silent operation. Cost-effective operation: battery-free operation, 30-60 days lasting fragrance cartridge, fragrance covering up to 170 m3 airspace (40 m2 - 60 m2), easy handling.