There's a flashing LED light inside the thing and the driver controls how the light behaves. I grant that this is at best unnecessary, but let's just say that t

There's a flashing LED light inside the thing and the driver controls how the light behaves. I grant that this is at best unnecessary, but let's just say that the market for wired mice with decent ergonomic characteristics and heft is dominated by people who really like flashing LED lights and so I took what I could get.