POC radio stands for Push-to-Talk Over Cellular radio. It's a type of communication device that combines the functionality of traditional two-way radios (like walkie-talkies) with the capabilities of modern cellular networks. POC radios use cellular data networks (3G, 4G, or even 5G) or Wi-Fi to facilitate instant communication between users.

These radios work similarly to traditional radios, where users press a button to talk and release it to listen. However, instead of using radio frequencies, POC radios transmit voice data over the internet using cellular or Wi-Fi connections. They operate using specialized apps or software platforms installed on smartphones or dedicated devices.