Two of the most common wireless control technologies in our daily lives are the IR remote and the smart key for vehicles . While both allow for remote control, they differ significantly in how they function, their communication protocols, and their security mechanisms. In this post, we’ll compare these two technologies in terms of principles, usage environments, and security. 1. Difference in Communication Method IR Remotes (Infrared Remotes) transmit invisible light signals via infrared LEDs. These signals are usually modulated at 38kHz and sent in a straight line toward the receiving sensor. Smart Keys use Low Frequency (LF: 125kHz) and Radio Frequency (RF: 315MHz/433MHz) to communicate. The LF is used to detect proximity, and the RF is used to exchange encrypted authentication data with the vehicle. 2. Distance and Directionality IR Remote: Typically works up to 5–10 meters, but must be aimed directly at the receiver with no obstructions. Smart Key: ...