Comparison between:
   
The Computer Dust Pump (CDP) and the Compressed Air Can

   
 
CDP Compressed Air Can
Ease of Use: Manual Push Button
45-Day Money Back Guarantee ? YES NO
Bad For Environment ? NO YES
Safe For Eyeglass  ? YES NO. Too Expensive & It May Damage It & Eye
Safe For Lamp, TV, PC & Laptop Monitor ? YES NO.  It May Damage it
Safe For Camera & Video Lense ? YES NO.  It May Damage it
Discolors Plastic (PC & Laptop Keyboard) ? NO Yes. It May Damage it
Durable & Long Lasting ? YES NO