You can get information about the hardware revision by
- Checking what its status page says:
Determining the Serial Number, Firmware Version, Hardware Revision, and Modem Support Version of a Peplink Device - Checking what the enclosure looks like:
What Is The Difference Between Hardware Revisions of Peplink Balance 380? - Checking its sales date (which tells you what the latest hardware revision the unit can be). The serial number of the device you provided a picture of makes it an October 2010 unit.
W.r.t. throughput, there is an overview (as of early 2017) at What is the Throughput for my Balance Hardware Revision?