A:Answer They're two different things. "Digital optical" refers to how the mouse senses that it's being moved over a surface. Old-style mice used a physical ball cupped inside the mouse to detect motion, translated that analog motion of the ballot digital signals which it then relayed to the computer. An optical mouse uses a low-powered laser, reflected off the surface over which the mouse moves, to detect how the mouse is being moved.
Bluetooth is how the mouse communicates the movement to the computer. An old-style was physically connected to the computer with a cable that ran from the mouse to the computer to transmit the signals of how the mouse was being moved. With a Bluetooth (cordless) mouse, you connect a small dongle to the computer, and the mouse communicates wirelessly with that dongle, using the Bluetooth wireless protocol to tell the computer how the mouse is being moved.
