Product Description: .Interface: USB 2.0, Resolution: 1600DPI .Tracking Method: Optical, Rated working Voltage: 3.0V .Rated working Current: 25mA, Button: Button: 3 buttons with scroll wheel .Wireless Operate Distance: Up to 10M, Size: About 4.1 x 1.9 x 1.4 inches, Wireless carrier frequency: 2402MHz-2480MHz .Applications: advertising promotions, business gifts, birthday, wedding, fairs, anniversary celebrations, opening ceremony, employee benefits, public relations planning