In Betaflight OSD, you have two different RSSI options RSSI Value (in percentage) and RSSI dBm Value. As you can see in this conversion table between dBm and mW, it perfectly demonstrates the benefits of using dB over mW. It’s just so much easier to use dB when there are so many zero’s in mW. Using dBm is preferred over mW because receivers can detect incredibly weak signals that are difficult to express in mW. 130dBm is the hard limit, however in reality the lowest RSSI is usually not that low as it depends on the update rate and signal frequency. RSSI starts from 0 as the highest value, and goes down as signal decreases. RSSI (Raw Signal Strength Indicator) measures the strength of a received signal and is crucial in determining how much range is left during a flight. RSSI is measured in dBm (decibel milliwatts), a logarithmic scale, as opposed to mW (milli-watt) which is a linear scale.
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