1st day fresh for 100 days (50 days each, on low). Recharge. Formulated With: no dyes; no phthalates; no formaldehyde. Low level indicator. Blue light flashes when it might be time to refill. Febreze warmer has a blue light that: Flashes twice when first plugged in to show it's working. Flashes continuously when it may be time for a new refill. For use with P&G air fresheners. See device insert for additional safety information. Terracycle. Recycle at Terracycle.com.