The cellular USB WiFi hotspot is a simple way to provide your CANedge2 WiFi CAN logger with a 3G/4G access point. Insert your SIM card, add the SSID/password in the CANedge2 config - and power the hotspot.
The hotspot can be powered via any standard USB power supply (e.g. in a vehicle) or it can be optionally powered via the CANedge2 2nd port via the DB9-USB adapter. In the latter case you can still log data from both CANedge2 channels by using a DB9-Y-splitter.