The cluster identification number that uniquely identifies the type of the devices.

When a CleanAir-enabled AP detects interference devices, these detections, of the same device from multiple sensors, are merged together to create clusters. Each cluster is given a unique ID. Some devices conserve power by limiting the transmit time until actually needed, which causes the spectrum sensor to temporarily stop detecting the device. This device is then correctly marked as down. A down device is removed from the spectrum database. In cases when all the interferer detections for a specific device are reported, the cluster ID is kept alive for an extended period of time to prevent possible device detection bouncing. If the same device is detected again, it is merged with the original cluster ID and the device detection history is preserved.

For example, some Bluetooth headsets operate on battery power. These devices employ methods to reduce power consumption such as turning off the transmitter when it is not actually needed. Such devices can appear to come and go from the classification. To manage these devices, CleanAir keeps the cluster IDs longer and merges them again into a single record upon detection. Preventing bouncing smoothens the interference device records and allows the records to accurately represent the device history.