Simplicity. It's not as "strong" as a can of air because they burst out of a narrow hole in the straw. However, the constant buying of new cans is very annoying, and as everyone knows, the air pressure in them gets weaker and weaker by the second. that he can continue to work at full strength for quite a long time in one sitting. The ability to switch to vacuum mode is actually pretty nice too so I can vacuum up clumps of computer dust.
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