Fantech W192 GO Wireless Mouse Perfectly stable without the hassle Purely silent design & No distractions Just the right size Up to 3 Months of battery life Sensor Technology: Optical Sensor Resolution: 1600 dpi Battery Life: Up to 3 months Battery Type: 2AAA Buttons: 4 Wireless Distance: Max 10 meters Wireless System: 2.4GHz Connection Type: Wireless (USB Receiver)