This is a little 4-channel audio recorder with 4 microphone inputs and 4 headphone outputs. It can also be used as a USB audio device. The only thing that would make this better is if it had an additional line output to run into switchers like the ATEM Mini.
The BTA-2 is a bluetooth adapter that lets you pair your phone into one of the channels, which is an easy way to record phone calls. It is usually sold separately.
Product info: https://geni.us/FSTZJiA