A low sensitivity number indicates:

A low sensitivity number indicates that the device is optimized to detect signals that are stronger and more pronounced. This means it has the capability to sense a wider range of signals effectively, focusing primarily on more robust electrical activities from the heart. In cardiac devices, sensitivity refers to the threshold level at which the device can detect electrical signals; a lower threshold allows the device to discriminate between normal heartbeats and noise more efficiently. This can be particularly beneficial in ensuring accurate pacing and monitoring of the patient's heart rhythm.

In contrast, higher sensitivity numbers could lead to the device picking up more ambient electrical noise, which could result in false readings or inappropriate pacing therapies. Thus, a device with a lower sensitivity is designed to effectively identify significant cardiac signals while ignoring less relevant ones.