A heart rate monitor is a device that measures pulse and sends the reading to another system or display. In fitness gear, it is often built into a chest strap or wearable band and uses sensors plus a wireless link such as Bluetooth to report data in real time.
In cyber security, heart rate monitors matter because they are connected devices that handle personal biometric data. The important questions are how the device pairs, how readings are transmitted, and where the data is stored or logged. Attackers may try to intercept, spoof, or manipulate wireless sensor data, while defenders look for secure pairing, clear documentation, trustworthy firmware, and careful data handling. Open hardware versions can help reviewers study these choices instead of treating the device as a black box.