For a list of all currently documented Ralink chipsets with specifications, see Ralink.
Embedded LTE WiFi VoIP Router, Home Gateway
R500 overview on BandRich's site
This device uses a Ralink RT??52 SoC.
"HW00741015 WVRTR-124GN_V01" and "ESX-X04-0701 RoHS" is silkscreened on the board in the FCC photos.
The Mini PCIe (USB) slot is occupied by a mobile broadband modem using the Qualcomm MDM9600 (Gobi) chip.
There is a label on the bottom of the board (in the FCC photos) with a MAC starting with 00:26:FA (BandRich).
The FCC router manual's sample SSID is LTE_ROUTER, which does seem to be used by (a very small number of) some BandRich (OUI 00:26:FA) devices. This is presumed to be the SSID (and OUI) for the device. The default IP may be 192.168.1.1, but the manual does not list the default credentials (Please refer to the Quick Start Guide included in the package.).