Ultra Duster will safely blast away any dust, dirt and unwanted micro-particles from computers, keyboards, printers and other electronics equipment and will not leave any residue. It effectively cleans by reaching those hard-to-clean areas and therefore helps maintain premium levels for electronic devices. Contains 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.