Final answer:
Entertainment Centers, especially TVs, commonly use Infrared Connectivity via remote controls. Unlike Bluetooth or NFC, infrared requires a direct line of sight to function.
Step-by-step explanation:
An example of a device that commonly uses Infrared Connectivity is an Entertainment Center. Infrared signals are utilized by remote controls to change channels and settings on devices such as televisions. Unlike radio waves, used in technologies like Bluetooth and WiFi, infrared signals require a direct line of sight to the receiving device. This is why your TV remote needs to be pointed at the TV to work. However, some remotes have shifted to using Bluetooth to alleviate the need for this direct line of sight.
Other wireless technologies, such as Bluetooth, use the 2.4-GHz microwave frequency range for communication between devices. Examples include connecting headphones or earpieces to radios or linking a driver's cell phone to a hands-free automobile device for answering calls. There's also NFC (Near Field Communication), which allows cell phones to initiate payments without a physical credit card, thanks to a secure, very short-range microwave frequency interaction.