Bluetooth are more expensive than the infrared-enabled ones.

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Wireless Devices(2)

legalcu.com With speakers going wireless, it is no surprise that other computer hardware, such as the keyboard and mouse, will also be developed to connect through infrared. Since the mouse and keyboard are used near the CPU and monitor where most sensors are located, infrared is enough to establish a connection. Some companies, however, developed keyboard and mouse that use Bluetooth, but these are more expensive than the infrared-enabled ones.

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