Use Power Duster to blast away all dust, dirt and microscopic debris from hard-to-reach areas. Eliminate residuals from areas once thought to be impossible to clean. Power Duster is specifically formulated to keep equipment clean, prolonging equipment performance and longevity. By using the handy trigger and extension tube, precision cleaning is both safe and easy. Ozone-safe Power Duster leaves no residue, and the shelf life is indefinite. Ideal for use on computers, keyboards, lab equipment, printers, fax machines, copiers, scanners, telephone and audio equipment, clocks and timepieces, TVs, VCR, CD, DVD, small engines, engine parts, power tools and more. Power Duster II contains 134A propellant, which is recommended for use on energized equipment. Duster contains bitterant to discourage inhalant abuse.