Hi Pete:

They sound like old 11 meter walkie talkies. The hiss is from the
super-regeneration. They can be converted to 10 meters by substituting a 10
meter crystal for the 11 meter one in there and retuning both the
transmitter receiver. Generally, that takes only one coil adjustment on
each. When the band is open, you can hear a lot of signals.

They will be under 100 mw.

Colin K7FM