Refresh your home with the Westin White Tea Scent System. The Westin White Tea Refill Cartridge will keep your home a soothing reminder of your favorite Westin Resort experience. Made exclusively for the Westin White Tea Scent System Diffuser - just insert the cartridge, plug in, and enjoy. One cartridge effectively freshens 500-1,500 square feet of your home and lasts approximately 300 hours. The ScentWave scent delivery system uses a dry-air technology that releases fragrance without sprays, aerosols or messy oils. Adjustable duration and intensity settings and built-in 24 hour timer make it easy to customize the scent for any environment.