First of all, let me get things straight. This is not called the cleaning pen. It’s called the OXO Good Grips Electronics Cleaning Brush. But I think cleaning pen seems like a deserving name for it simply because it looks like a pen.
On one end of it is a brush that’s retractable and on the other end is a pointy silicone that has a tiny cap that can be used to protect it when it’s not in use.
The purpose of the brush is to clean up the dust that is stuck in hard to reach places such as between the keyboard keys, camera lens and etc. The pointy silicone on the other hand is best used to clean up dirt that is found in tight corners of a watch, jewelry, key etc..