Efficient – the fan only turns when the lights are on, which extends the alkaline battery life up to 6 months. | The Easy Fresh reminds you when to service it through 3 prompts: Green blinking LED – Good (first 30 days) Red Flashing LED – Replace Cover. (After 30 days) No light – Needs battery & cover | Audible alert, discretely notifies service needed every 3 ½ minutes. (after 33rd day). | Can’t spill or misfire – safe for you and your facility | Use Easy Fresh Covers #FREF24-CM (Cucumber Melon) or #FREF24-MA (Mango)!