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Now, there are other systems as well. I'm sure everybody knows what DMR is. So, DMR, which stands for Digital Mobile Radio, this is something HAMS used, right? I'm sure I've got like three of these radios sitting here. The way they work is they provide two slot TDMA, so you get two conversations per channel, and it's actually heavily used in major urban centers here in Toronto. It's used all the time outside of police, outside of public safety. It's often used. Let me cycle it.