Lefon New Upgraded Rechargeable Wirele Mouse Ergonomic Optical 2.4G 1000/1600/2400 DPI Wrist Healing USB Vertical Mice For for Windows MAC IOS 800 mAh rechargeable battery, DPI up to 2400DPI, private model products, using 6 sets of grinding tools, 20 screws inside, environmentally friendly ABS material, can be used to test 10 meters down to the floor. Note: Lefon vertical mouse is different from the low-end products are made of inferior materials, and the same appearance. The DPI is only 1600. Specification : Button number6 buttons Tracking System: optical Frequency: 2405MHz-2476MHz Effective distance: 10m Working voltage/current: 3V/4mA Button life: 5 million times Roller life: 1.2 million turn Product dimensions: 110 x 72 x 75mm Product weight: 1305g Resolution: 1000-1600-2400 DPI Rate of return: 250Hz System Requirements: IBM or compatible computer Windows2000/ME/XPx64/Vista/7/8 Mac OS Xover V10.4 An available USB portCharging Instruction:When charging, the scroll wheel lights up in green, and the green light is off when fully charged. Charging Instruction: When charging, the scroll wheel lights up in green, and the green light is off when fully charged. Package Includes: Mouse x1 Usb Receiver x1 Usb Charge Cable x1 Instruction x1 FQA: What to do if the mouse has no response? 1.Please charge the mouse with USB cable. 2.Make sure the power switch on the bottom of the mouse is on. 3.Try to restart the computer. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.