Received Signal Strength Indication (RSSI) is measurement of the power present in a received radio signal. The RSSI of presented by Anchor is indicated by a negative value. This value relates to the signal strength from the transmitter (Master) to receiving Anchor. The higher the number, the better the signal. However, -90dBm and higher values usually equate to the Anchor being in an excellent coverage area. The closer to -80dBm, the stronger the signal.