... 4.1 year warranty 5.CE,FCC,RoHS OEM USB Optical Mouse Good Quality This is a great mouse, ... needed after battery replacement.With 6 Keys, including Scroll Wheel, Page Forward and Page Backward buttons for ... : 2402-2480MHzRF operation channel: 16, auto frequency hoppingUSB: USB 2.0Operation systems: Windows 2000, Me, XP, Vista, ... a satisfactory solution along with you. OEM USB Optical Mouse Good Quality