The distinctive looking R.A.T. 9 from Mad Catz is definitely the most customizable wireless gaming mouse you will ever come across. With three different palm rests, three different pinkie rests, an adjustable thumb rest, and an adjustable weight cartridge, this mouse gives you a lot of tweaking options to make sure it snugly fits your hand. The R.A.T. 9 connects to your PC via a USB-powered RF receiver that also doubles up as the battery charging station. Don’t worry about missing out on any action because of low battery – the R.A.T. 9 comes with two rechargeable battery packs, so you can keep one charged while the other one is in use. All in all, this is one excellent mouse for the hardcore PC gamer.