Minitor V. I don't put mine in the charger because none of the chargers I've seen are very good. I just switch out batteries. Minitor IV were the best. Juniors are allowed to carry pagers, following strict rules.
Minitor V with stored voice which is good and bad for a variety of reasons. The playback is nice. The static between the tones and voice message is irritating. It's in for repair right now. I lost the knob to the channel selector. I also will not charge it in the charger. I have two batteries which I swich back and forth. Jr. Firefighters are given old Minitor II's which honestly, probably, are more reliable than most of the III's and IV's that we have.