TONOR Ergonomic Wireless Mouse with USB Receiver Ergonomically designed, comfort grip. Tiny and fit well. Page forward and page backward function, let you do your job faster. 3 DPI resolutions: 800/1200/1600.Works with Windows 2000, Me, XP, Vista, Win 7 and Mac. Plug and play. *Note:To replace the batteries, please tap the base of the mouse,batteries will come off easily.Any question, contact seller with subject Difference from Tonor Wireless mouse with others on Amazon:1. Well packed with Tonor branded plastic bag.Perfect gift for friends and families.2.Higher quality,longer life time.More than 2 years.3.12 months warranty offered, no worries buying.Our warranty is simple,replacement or refund without asking a question,no return requested.