Ultra Duster will safely blast away any dust: dirt: and unwanted micro-articles from computers, keyboards, printers, and other electronics equipment, Will not leave any residue. It effectively cleans by reaching those hard to clean areas and therefore helps maintain premium levels for electronic devices. Ultra Duster is earth-friendly and containers no CFCs (Freon). Ultra Duster contains a bitterant additive that discourages potential abusive and misusage of the product by making its contents unpleasant to inhale.