Features:Produces ozone to eliminate odors caused by messy ingredients in the fridge, safe to use and no residue.It can also oxidize ethylene to extend the freshness of food, reducing food spoilage.Two working modes: standard mode(works about 3 weeks) and strong mode(works 3 hours).No consumables and no filters to replace! Stop wasting money on charcoals, baking soda and air filters.Suitable for fridges, freezers, shoe cabinets, closets, wardrobes, cars, pet rooms, washrooms etc.Specification:Color: WhiteMaterial: ABSOzone concentration: 20mg/hCharging input: 5V/1ABattery capacity: 800mAhCharging time: 1.5 hoursWorking time: 40 hoursNote:Please allow 1-3cm (0.4-1.18") difference due to manual measurement and slight color variation for different display setting.