Features: 1. New Upgraded: Unique charging technology,b uilt-in lithium battery 2. Silent Design: The left and right click are both silence, no sound when you click 3.4 keys, more convenient for game operations 4. 3 kinds DPI adjustableprovides precise positioning 5.Rechargeable:Built-in rechargeable battery, 2-3 months of use after 3-4 hours charging 1. New Upgraded: Unique charging technology,b uilt-in lithium battery 2. Silent Design: The left and right click are both silence, no sound when you click 3.4 keys, more convenient for game operations 4. 3 kinds DPI adjustableprovides precise positioning 5.Rechargeable:Built-in rechargeable battery, 2-3 months of use after 3-4 hours charging Specifications: Item Name: Wirele Mouse Buttons:4 buttons The Max DPI: 1600DPI Ajustable DPI Switch: 800/ 1200 /1600DPI WiFi Range: 10M Battery: Rechargeable Charging Cable Length: About 50 cm Switch Life:10 Million Times Size: 112*57*20mm Support System: The 2.4G usb version support Windows/Mac , The Bluetoothversion support Windows/Mac /ios / android, Package: 1 x Wirele Mouse 1 x USB Receiver 1 x Charging Cable Q&A : Q1:What the different with the 2.4G wirele version and bluetooth 4.0 Version ? A1 : the2.4G Wirele version work via usb receiver ,can't work via bluetooth the bluetooth version workvia receiver and bluetooth , it is dual mode