They are what they say they are - dynamic. Built to be able to rapidly change temperature and accommodate a very wide range of temperature and power requirements, Dynamic Temperature Control Systems allow for fast and precise thermal control of external applications.
Note that these are not "baths" per se; they have an internal reservoir and do not have an accessible bath into which objects can be placed. If you want something with an accessible bath, see the circulating baths. Dynamic Temperature Control Systems are more akin to recirculating chillers, only they heat as well and generally have far more precise temperature control.