The Heartbeat-ID scanner measures your heart signals contactless at your wrist. These signals are compared to a special pattern on your chip card. When there is a match you will be authenticated to a system.
In this way the Heartbeat-ID scanner is used as a biometric device. Two differences with other biometric methods are that you do not need an extra life-measurement and you cannot fraud.
Every human being has a unique Heartbeat-ID. This is independent of the frequency of the beating heart.