Trackball Style mouse ergonomically designed to reduce stress and discomfort in your hands, wrist, elbows, forearms, and shoul Multi Mode - Bluetooth or 2.4 GHz Wireless (with USB adapter) - Control up to three computers with one mouse Adjustable DPI: 100 - 200 - 400 - 800 - 1200 DPI Compatible with Windows, Mac, Android, iOS, Linux (to use this mouse with an iPhone or iPad you must update to iOS 13 or above) Number of Buttons: 6 (plus scroll wheel), All Silent Buttons: Adjustable DPI/sensitivity button, Mode/Pairing button, Low battery indicator, Next/Last Page (for web browsing) Dimensions: 5.4" (L) x 4.0" (W) x 2" (H), Weight: 4.5 oz Our trackball is ergonomically designed for maximum comfort. It features multiple modes, allowing you to connect to your computer with wireless USB or Bluetooth. The unique hand-sculpted shape is designed to reduce stress in your wrist, elbows, and shoulders by maintaining a comfortable grip and using your thumb to move the cursor With all silent buttons this mouse is perfect for working quietly so you don’t disturb your roommates. Our mouse is easy to connect and will stay paired to your computer for convenient, wireless use whenever you need it. With an advanced optical tracking sensor, our mouse is highly responsive and precise.