DESIGNED FOR SIMPLE LIFE Wireless Mouse--Advanced Optical tracking technology with fast click and responsiveness, 1600 default DPI increases work efficiency by 50% while using safari, Word, Excel, Adobe or other program. ONLY 1 AA BATTERY IS REQUIRED Wireless Mouse-- 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 Note: The receiver is on the side of the battery box, if you can't find it, please contact in time ENJOY NOISELESS CLICKING Wireless Mouse -- slim mouse adopting high-end structural design, reducing click noise for you by 90%. You don't have to worry about being disturbed by annoying clicks, enjoy your desktop life anytime, anywhere! PORTABLE & DURABLE Wireless Mouse-- USB-receiver stays in your PC USB port or stows conveniently inside the wireless mouse when not in use. Perfect for work and entertainment in home or office. Note: The receiver is on the side of the battery box, if you can't find it, please contact in time