Colour options: Choose from either white, pink or green. Usage: Plus in via USB - spray lasts approximately 10 hours in total. Humidifier: Grab yourself a crystal salt stone humidifier. Refresh: Clean and revitalise the air in your room of choice - feel rejuvenated and ! Coverage: Reaches up to 10 square metres. Size: This humidifier measures 9.65cm x 9.65cm x 11.25cm. | Crystal Salt Stone Humidifier | Wowcher