Jelly Comb Bluetooth Ergonomic Mouse, Advanced Vertical Wireless Bluetooth Mouse 2.4GHz Optical Vertical Mice, Easy Switch Between 2 Devices with Bluetooth and USB Connection MV045 (Black) Wireless Optical Mouse with Bluetooth  (2.4GHz Wireless, Black)

Advanced Ergonomic Design: The ergonomic design places your hand in a natural handshake position and offers your hand maximum support for lasting comfort. Concave area for Thumb and little extended bottom edge for pinky finger, smoother moving and more comfortable grip. Effectively reduces the wrist strain and pain. Silent Click & Adjustable DPI: Quiet clicks can bring a better user experience and free your worry about bothering others and keep you stay focused while working. 3 adjustable DPI levels (1000/1600/2400) allows you to change the cursor sensitivity easily