The Gretz Aero GA-TB is a very small audio tone generator used to make an audio annoucement through your headset advising of a user selected function. This warning tone can be used to get your attention for one of a variety of events. Examples of uses are: Clock alarm, gear warning, canopy not latched, door not latched, engine monitor function out of tolerance, low oil pressure, low voltage, stall warning, GPS generated warning, or one of many other warning uses.
The Gretz Aero GA-TB puts out an audio tone with a closure of contacts in a user installed switch, or an internal switch in a device like a clock or other device. This contact closure switch can be used to supply + voltage to the Tone Board, or the switch can be used to supply a ground source for the Tone Board. It is your choice.
As you can see in the photo, the Warning Tone Generator is very small. It can be mounted to any flat surface with one screw through the circuit board through the provided mounting hole. To insulate the circuit board from ship ground a provided non-conductive gasket is required to be placed between the backside of the circuit board and the conductive structure it is mounted on.
The GA-TB is designed to work with 12 volt systems.
Weight 1/4 ounce
Length 1 7/8 inches
Width 3/4 inches 
The GA-TB comes with instructions for mounting and installation.
Warning Tone Generator: part # GA-TB $50
