its a logitech optical mouse and the 2 things in the front are gone mia but the back one is still there. i gotta clean it 2 or 3 times a day,i dunno where the crap keeps commin from lol. its not a big big prob but it really sux when playin cod or something where i gotta turn real quick and the damn thing sketchs and i gotta kinda turn twice if u get what im sayin,kinda of the same thing when a ball mouse gets real dirty and the ball just rolls on the dirt instead of movin the wheel thingys. lol thingys, im real down with the pc lingo lmao