2 pairs of headphones, have better semi-hard keyboard keys, not the very soft ones that irritate you after 2-3 years of use and don't press well. Very good readable screen- lighting.

Quite an economical and practical solution. I use them in my office for professional use.
On the downside, the connecting cable to the phone is different from the common cables.
Also, if you have two phone lines, it does not support double or triple connections. It is only for one line with multiple connected devices