Logitech G309 LIGHTSPEED is a lightweight gaming mouse that weighs just 86 g with the included AA battery or 68 g (battery-free) with use of POWERPLAY wireless charging system Switch between the robust yet low latency LIGHTSPEED wireless and Bluetooth connectivity on this wireless gaming mouse for total wireless flexibility Max Precision: HERO 25K sensor on this wireless gaming mouse tracks exactly to the sub-micron with zero smoothing for precise wireless gaming Min Charging: 300+ hours with AA battery or unlimited battery life with POWERPLAY, so you can focus on the game, not your battery life Max Speed: LIGHTFORCE optical-mechanical switches with optical speed, mechanical feel, and optimized gaming performance Max Control: Up to 6 programmable buttons for personalized gameplay and custom shortcuts