"Master Grip" designed to reduce stress and discomfort associated with overuse in your hands, wrist, elbows, forearms, and shoulders by maintaining a neutral "handshake" grip. Triple Mode - Bluetooth x2 or 2.4 GHz Wireless Mode (with dongle) - Control three computers with one mouse Switch from one mode to another with the push of a button. Connects by Bluetooth or USB Dongle for Wireless connections Number of Buttons: 7 (plus scroll wheel), all silent, Rechargeable battery Adjustable DPI/sensitivity button (800 - 1200 - 1600 - 2000 - 2400 DPI), Bluetooth pairing button, Low battery indicator, Next/Last Page (for web browsing) Custom software to customize buttons, adjust DPI, refresh rate, LED light, and more Dimensions: 4.88 x 2.99 x 2.64 inches, Weight: 3.9 oz This is our most comfortable mouse ever. It features dual modes, allowing you to connect with a wireless USB adapter or Bluetooth. You can even control two computers with one mouse (not simultaneously). The unique hand-sculpted shape is designed to reduce stress in your wrist, elbows, and shoulders by maintaining a neutral, ergonomic, “handshake” grip. With all silent buttons this mouse is perfect for working quietly so you don’t disturb your roommates or when you don’t want people to hear that you are on the computer. 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