LIFETTIME RISK-FREE WARRANTY - We promise a Life-time Money Back or Free New Replacement guarantee if you received defective products or have any questions with this wireless mouse PLUG & PLAY SUPER EASY TO USE - Really plug & play design, no drivers need to be installed. 2.4GHz wireless transmission technology provides a powerful and reliable connection up to 33ft PORTABLE SIZE & NOISELESS CLICK - Portable design make it easy to store in bag for traveling, responsive buttons provides very soft click with less noise, no more disturbing for others with the loud clicking sound ONLY 1 AA BATTERY IS REQUIRED - It takes only 1 AA Battery(NOT Included) to operate this mouse, and the wireless mouse will turn to sleep mode in 10mins of inactivity for energy saving, can be easily activated by clicking any buttons UNIVERSAL COMPATIBILTY - Work perfectly for Windows XP, Windows Vista, Windows 7, Mac OS X 10.4 etc.