Got them for my 3 year old because the ben 10 ones just didn't do everything we wanted.
Used them on a large holiday resort in Turkey to keep in touch when we went to different parts. The staff used the same ones to organise themselves, so we changed to channel 2. But when my wife was doing the 3am feed of our 4 month old baby, she'd switch back to channel one and play the creepy nursery rhymes from the baby toys to any lonely worker stranded alone on reception whilst the rest of the resort slept. Muuhahahahaaaaa.