IrDA uses infrared (IR) signals to send data for IrDA 1.1. The average distance is 3 to 6 meters. Some IR technologies have a maximum distance of 1.5 miles. Because IR signals are used to transmit data, distance capability for long-range IR varies with weather conditions (such as humidity). IR is a line-of-sight technology operable on a clear path between the transmitter and receiver.
CISSP Study Guide: Using IrDA in Networking


Building a Security Team
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A quick guide to digital forensics and incident response (DFIR): what it is, when it’s needed, how to implement a cutting-edge program, and how to develop DFIR skills on your team.