W-2: This is your most important form. Youâll need one from each employer you worked for over the past year. A W-2 shows the amount of money you earned, the amount withheld for income taxes and Social Security and Medicare taxes, and any contributions you made to a retirement plan, medical accounts, or child care reimbursement plan.
IR wireless (infrared wireless) IR wireless is the use of wireless technology in devices or systems that convey data through infrared (IR) radiation. Infrared is electromagnetic energy at a wavelength or wavelengths somewhat longer than those of red light. The shortest-wavelength IR borders visiblered in the electromagnetic radiation spectrum;the longest-wavelength IR borders radio waves.
Using Passive Infrared Detection. Passive infrared sensors detect the proximity of humans and animals. These systems, popular in both indoor and outdoor security systems, work by detecting the change in infrared thermal heat patterns in front of a sensor. This sensor uses a pair of pyroelectric elements that react to changes in temperature.