Security operations need three things from a radio: instant one-to-many broadcast (not a phone call), GPS location of every guard on a central display, and a panic/SOS button that sends coordinates to the control room. POC radios deliver all three over cellular, without the range limits of traditional analog security radios.
Emergency SOS with GPS is the feature that matters most for security — a guard hits one button, dispatch sees exactly where they are. Horizon's web console is the command center view security operations are built around. Monthly cost is tax-deductible as an operational expense.
For contract security companies that can't justify Hytera's per-seat fee. Runs Zello, which has its own dispatch-like features at lower cost. Android-based means guards can also use it for incident-report photo capture.
Simplest, cheapest option for a small-site security team that just needs a talk channel. Physical buttons work with gloves. No dispatch platform, but at this price you can equip every guard without a large budget ask.