Logitech Silent Wireless Optical Mouse M221 Color:Black DPI 500/1000/1500/2000 /2500 /3500

DPI 500/1000/1500/2000 /2500 /3500

Keycaps: SlimHotkeys: NoCharacter: Laser EngravingSplash Proof: NoAdjustable Keyboard Legs: NoRating: 5 V / 30 mAhCable Length: 60 cm ( Retractable Cable )Port: USBIlluminated: NoSystem Requirements：Windows XP / Vista / 7 / 8 / 8

Focus Type: Fixed Focus

1(32/64-bit)

Flash Type

Logitech Silent Wireless Optical Mouse M221 Color:Black DPI 500/1000/1500/2000 /2500 /3500Connection Type: 2. 4 GHz wireless connectionWireless range: 10 metersConnect Power: Yes, on off switchBattery Details: 1 x AABattery life: 18 months**Battery life may vary based on user and computingDPI (Min Max): 1000Sensor technology: Logitech Advanced Optical TrackingSensor resolution: 1000 dpiScroll Wheel: Yes, 2D, opticalNumber of buttons: 3Standard and Special Buttons: Middle click