2.4 GHz & 5 GHz (vs 5G)
Two WiFi radios that operate on your router at different frequencies (measured in gigahertz.) Respective strengths: 2.4 signal travels farther - 5 can accommodate more client devices and at greater bandwidth. Most IoT devices (and most Wyze cams) operate at 2.4 only.
Contrast 5G which is a cellular radio and stands for 5th Generation.