Never had a DRE... My LightSPeed's ANR works whether the unit is plugged or
unplugged... Kinda eery to use it standing aroound in the hangar... It gets
spooky quiet... Even what sounds like quiet to us normally is surprisingly
immersed in a background level of noise that you just don't notice... Some
guys take their ANR headset on an airline trip because it makes the cabin so
much quieter... Best you call DRE...
Denny

"Mike Noel" wrote in message
...
Just received these today and loaded two 9v batteries into the enr unit.
Not having an intercom handy, I tried pushing the ON button and get a
green
battery indication while the button is depressed, but the unit turns off
when the button is released. There is no aural indication of enr
activating. Does an active headset like this need to be plugged into an
intercom before the enr kicks in?

Mike in Tucson.