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2. Optical trackpad - Wikipedia

   en.wikipedia.org/wiki/Optical_trackpad

   An optical trackpad is an input device based on an optical sensor, which detects the displacement of a finger that is moving on top of it. [1] The sensor is used typically in smartphones, where it replaces the D-pad, and in ultra-portable or ultra-mobile PCs, where it replaces touchpads, pointing sticks or trackballs as pointing device .

3. Bluetooth - Wikipedia

   en.wikipedia.org/wiki/Bluetooth

   Bluetooth is a short-range wireless technology standard that is used for exchanging data between fixed and mobile devices over short distances and building personal area networks (PANs). In the most widely used mode, transmission power is limited to 2.5 milliwatts, giving it a very short range of up to 10 metres (33 ft).

4. Optical networking - Wikipedia

   en.wikipedia.org/wiki/Optical_networking

   Optical networking is a means of communication that uses signals encoded in light to transmit information in various types of telecommunications networks. These include limited range local-area networks (LAN) or wide area networks (WANs), which cross metropolitan and regional areas as well as long-distance national, international and ...

5. File:Mouse mechanism diagram.svg - Wikipedia

   en.wikipedia.org/wiki/File:Mouse_mechanism...

   Description. Mouse mechanism diagram.svg. English: Diagram of a mechanical mouse. Pulling the mouse turns the ball. X and Y rollers grip the ball and transfer movement. Optical encoding disks include light holes. Infrared LEDs shine through the disks. Sensors gather light pulses to convert to X and Y velocities.

6. Rotational mouse - Wikipedia

   en.wikipedia.org/wiki/Rotational_mouse

   Rotational mouse. A rotational mouse is a type of computer mouse which attempts to expand traditional mouse functionality. [1] The objective of rotational mice is to facilitate three degrees of freedom ( 3DOF) for human-computer interaction by adding a third dimensional input, yaw (or Rz), to the existing x and y dimensional inputs.

7. Infrared Data Association - Wikipedia

   en.wikipedia.org/wiki/Infrared_Data_Association

   Infrared Data Association. The Infrared Data Association ( IrDA) is an industry-driven interest group that was founded in 1994 [1] by around 50 companies. IrDA provides specifications for a complete set of protocols for wireless infrared communications, and the name "IrDA" also refers to that set of protocols. The main reason for using the IrDA ...