Delux Ergonomic Wireless Mouse, Pro 2.4G Portable Mobile Mouse Optical Mice with USB Receiver,Adjustable DPI (800/1200/1600/2400), 6 Buttons for Computer, PC, Notebook, PC, Laptop

FIRSTMEMORY Scientific Wireless Ergonomic Mouse designed with palm, thumb, and little finger rest and relieves pressure in wrist joint and reduce risk of cramping. Say goodbye to "mouse hand".  Whether these following problems bother you?    Hand numbness /Elbow stiffness / Wrist store / Unable to move   Why you need our Ergonomic vertical mouse?  ?Say goodbye to wrist pain  The ergonomical mouse design with palm / thumb / little finger rest and grip fit the contours of the palm for maximum comfort. It will help to reduce the pressure and pain of the wrist, which is perfect for anyone who experiences wrist or hand fatigue when using a regular mouse.   ?Smart Energy-Saving Technology This wireless ergonomic mouse will enters power saving mode after several minutes idle, press any button to wake it up. ?Easy-access use     6 Buttons give you improved control over your computer's systems. Backward / forward buttons on the left side of the mouse provide great convenience for web browsing. Comfortable touch and all buttons are activated with a reasonable level of force.  ?WORRY-FREE WARRANTY    At FIRSTMEMORY, we believe in our products. So we offer 18-month warranty?repair or replacement?and friendly customer service, easy-to-reach support.    Specifications: Weight: 140 g Voltage: 3.7V Polling Rate: 125Hz  Connectivity: Wireless DPI:  800/1200/1600 /2400 Operation Current: 9mA  Sleep Current: 60-80 uA  Dimension: 4.33* 3.22 * 1.49 in Key Life: 5-million times  Power Supply: 2 * AAA Batteries(not include) NOTE: 1.Battery life may vary based on user and computing conditions. 2. The USB receiver is in the slot in the bottom of the mouse.