It is a 4 channel Mic/Line Pre with many of the same features as the SD552. This is a discontinued item from SD.
I would spring a little extra and find an SD552 and get the Internal Recorder, Dual AES3 Digital Outs, 5 channels in with 5 TA3 Direct outs.
Not sure what the 552's are selling for today, but they had been bottom dollar when I got mine. I think the only reason why was due to the SD663 hitting the market and all the pro market users upgraded. Last I had noticed, they have jumped back up in price.
I run my 552 all the time. You can monitor each channel by itself to adjust without impact to the recording itself. Usually I will record on the 552 internal recorder as a back-up, run the AES3 XLR Out to my S/PDIF in on my Marantz PMD661, and use the TA3 (mini xlr) Direct Outs to either my Tascam DR-70D or my ZoomH6. There's also a Balanced Stereo TA3 Output on both the 442 and 552. Many ways to share a mix or create several.