krk-3dh

I was at the Fire Dept today going through stuff as I am in charge of our GovDeals stuff. What do I have here, besides remote head radios? What model? I see TK-690H, TK-630H and then I see KRK-6DH and KRK-3DH. I dont know what the 2 heads in the one pic are. Are these high band or low? I tried a...