1st day fresh for 50 days (On low). Scratch and sniff. 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. Terracycle: Recycle at terracycle.com.