Final answer:
Bluetooth devices do not need a line of sight to connect, as they communicate using radio waves instead of infrared signals.
Step-by-step explanation:
Bluetooth devices do not need to be within the same line of sight to communicate. Unlike infrared devices, such as TV remotes, which require a direct line of sight between the emitter and receiver, Bluetooth uses radio waves in the 2.4-GHz range that can pass through obstacles. Bluetooth is a wireless technology that enables the connection of devices over short distances, facilitating communication between things like headphones and smartphones, or vehicles and hands-free devices for safe calling while driving.