Both mice are working and have no issues. The G502 is known from Logitech and has 11 programmable side buttons. It only needs cleaning as it has dust. The Logitech mouse is 50 because it was heavily used and thrown in the warehouse, but it is currently working fine. The Pulsefire FPS Pro mouse is clean and has no issues. This mouse is lightweight. Selling is easy, God willing. Both mice are excellent with excellent sensors. You can search for them: G502 has PMW3366, and the Pulsefire FPS Pro mouse has PMW3389.