Decibels are given in negative numbers because a 0 Decibel means that the human ears can just begin to hear that noise. Originally, this strength can be measured and its unit is Decibels Milliwatts (dBm).Ī wireless signal, such as Wi-Fi signals, is measured in negative numbers, which is the dBm. Wi-Fi signal strength refers to the wireless signals your device is catching/receiving off of the wireless router.
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