Wirele Mouse with 4000 DPI 4000DPI max. 99% Silent Clicking 3cm-thickne Ultra Slim For MacBook,iPad 99% Reduce Noise, Silent Click Perfect for public places such as study libraries, cafes, etc. It keeps silent click even at late night. It won't affect other people who concentrate on reading, studying, working or sleeping. Tiny USB Receiver, Universal Compatibility Plug and play, no driver required. Easy to set up for Computer, PC, Laptop, Tablet of all systems: Windows, Mac, Chrome OS, Linux, Android ...... 4000 DPI max. The switch DPI levels of this wirele mouse among 1000/1600/2000/4000 to meet your special needs with higher sensitivity. Accurately restore the movements under high-speed operation, perfectly for 4K/8K HD Display. 1-Level DPI : 1000, Mouse cursor moves very slowly, suitable for precise drawing 2-Level DPI : 1600, Mouse cursor moves slowly, suitable for daily office use 3-Level DPI : 2000, Mouse cursor moves at normal speed, suitable for 2K display/screen 4-Level DPI : 4000, Mouse cursor moves at fast speed, suitable for 4K/8K large display/screen 18-Month Battery Life Auto Sleep and On/Off Switch Mode for Saving Power Wirele Connection Get rid of me wired connection, wirele transmiion distance range up to 10M More Colorful Choices Works on Many Surfaces without Mouse Pad Battery Installation Steps (Attention please: Battery is NOT included) Open the cover Insert the battery Cover the cover