What are the 902-928 MHz, 915-928 MHz and 920-920.8 MHz frequency ranges network on home bases used for?

The FCC ID web site lists the power output of devices it has checked their supported frequency ranges

For the Eufy product range ((FCC ID 2AOKB-T8 [results]), the home base’s list the 2.412-2.462 GHz WiFi range (which is used to connected to the Eufy devices i.e. camera’s, etc) and their Power Output in mW

However, it also lists 902-928 MHz, 915-928 MHz and 920-920.8 MHz frequency ranges but these do not have and Power Output values apart from the T8001 and T8001CL home bases

The only Eufy devices that have those frequency ranges listed is eufyCam (T8111), eufyCam (T8111CL), eufyCamE (T8112).

Were those 902-928 MHz, 915-928 MHz and 920-920.8 MHz frequency ranges used for communication between the home bases and the those cameras before moving to the 2.412-2.462 GHz frequency range?

Model Description Frequency Range Power Output
T8001 HomeBase 902-928 MHz 23.2 mW
2.412-2.462 GHz 213.7 mW
T8001CL HomeBase 915-928 MHz 26.24 mW
2.412-2.462 GHz 213.7 mW
T8002 HomeBase E 920-920.8 MHz
2.412-2.462 GHz 514 mW
T8010 HomeBase 2 920-920.8 MHz
2.412-2.462 GHz 730 mW
T8010X HomeBase 2 920-920.8 MHz
2.412-2.462 GHz 630 mW
T8030 HomeBase 3 920-920.8 MHz
2.412-2.462 GHz 500 mW

The 900 mhz ranges are used for the entry and motion sensors. They don’t require any more than switch status and battery status bits in their transmission to Homebase. I believe the multiple ranges reflect slightly different spectrum assignments in Europe and Asia.

Since the current homebases only receive signals from the sensors, they don’t transmit anything in the 900 Mhz band, so don’t have a power value for Homebase 2 and 3.

From the specs, it looks like 900 Mhz was originally tried for cameras on the original Homebase and early devices, but replaced with 2.4 Ghz because of the bandwidth required.

Thanks for confirming my understanding (which I used the FCC ID web site to determine/decode)

The following devices were not on my original post as I hadn’t yet got that far through the FCC ID listing but align with your comments:
T8900 Entry Sensor 920-920.8 MHz
T8910 Motion Sensor with 920MHz 920-920.8 MHz
T8931 Smoke Listener 920-920.8 MHz
T8960 Keypad (Lora) 920-920.8 MHz
T8970 Outdoor/Indoor Siren 920-920.8 MHz

I forgot about the keypad in my post. It uses 900 Mhz band. The “smoke listener” and siren are not real products at this time.