Instruct: Classify Amazon reviews into positive or negative sentiment
Query: BEWARE: this is "Data Only" version (PX-211d)

First, it does seem to work fine for my fax machine. However, unlike the image of the box where it says "Telephone/VoIP" or other descriptions on web that talk about using Easy Jack 2 for voice communications, the product shipped is "Data Only" version (211d). There is humming noise in the background, so not good for voice. I'm a little frustrated but its too much hassle to try and send back.