You may good at shooting games, that is, you can point precisely with mouse. However, I bet most people will be more comfortable with pen rather than mouse. So why not just apply the pen’s targeting mechanism in mouse.

The Scope Node M-SN1UL from Elecom Japan wants to offer you a pen-like experience with mouse. Its laser generator is located in the position of the penpoint while holding a pen. In other words, you can use it just as precisely as a pen.