Scratch and sniff. 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. See inside panel for other cautions and information. For use with P&G air fresheners SY-982, 3260, and 3262.