WiFi 5 (802.11ac) operates on the 5GHz band which is typically less congested than the 2.4GHz band, providing better performance for devices that support it. Since the homeowner has multiple devices on the 2.4GHz band, using the 5GHz band can reduce interference and improve the video streaming quality of the smart doorbell. WiFi 4 (802.11n) can use 5GHz but is more commonly associated with 2.4GHz and does not exclusively use the 5GHz band. WiFi 6 (802.11ax) also supports both 2.4GHz and 5GHz bands but choosing specifically WiFi 5 ensures the device will use the 5GHz without specifying the exact technology.