Yes, is all text. Voice is instant, so better for most high priority things (rescues, equipment on/off, etc.), In some cases, like ours, text works fill the gaps or dead zones. In a larger operations it could keep comms channels open for higher priority things at a minimum. I do like the ability to have subchannels that groups can talk outside of the main channel.

Going to be testing them some with search and rescue soon to see if they'll fill any needs. Carrying small card deck devices into the bush to hang in trees to setup a mesh network is easier than bringing large radio repeaters and batteries into the bush or top of hills. Has some potential to fill some gaps in comms at least.

Nice thing is it's just like a texting app on the phone, so pretty much anyone can figure it out. Connect to your node via Bluetooth and you're good to go.