Both mice are working and have no issues. The G502 is known from Logitech, it has 11 programmable side buttons, it just needs cleaning as it has dust. The Pulsefire FPS Pro mouse is clean and has nothing wrong with it, this mouse is light. The sale will be easy, God willing. Both mice are excellent, they have excellent sensors. You can search for them: G502 has PMW3366 and the Pulsefire FPS Pro mouse has PMW3389.