Maintaining altitude has always been one of the most difficult tasks for pilots whether they are students or long term pilots. IFR and Flight Following requires the pilot to keep his aircraft within certain limits. The AA-1 Altitude Alert provides the pilot with alarms that activate if the pilot breaches cruise altitude by plus and minus 100 feet.
A Blue LED turns on when drifting high and a Red LED turns on when drifting to low. Both are accompanied by High and Low audio tones that can be interfaced to the headphones. All housed in a tiny plastic case about the size of a matchbox.