Nitro is a brand name for Motorola’s CBRS infrastructure. CBRS stands for Citizens Broadband Radio Service. It’s a fairly large section of 3.5GHz range that is more or less for companies on a decent size campus to basically have private LTE.
By basically having your own cellular infastructure outside of normal bands using what is more or less what your phone is using you have significant capacity and speed improvements where WiFi can’t keep up. If you’ve ever used WiFi in a large public space like a busy hotel or downtown area, you know how quickly it becomes congested and suddenly WiFi is way worse than your cellular data connection.
All the IoT devices such as cameras, handheld scanners for inventory, mobile credit card terminals, etc can run off of this network and not worry about a commercial carrier having overload or crowded WiFi band. The benefit with Nitro is out of the box it supports push to talk, just like the XP5 in the first picture - it feels seamless to the end user, and your capacity is barely dented by the digital voice.