The Garmin brand name was built by their GPS systems, but their other avionics are also quite good. The GTX-320 is their basic, no-frills transponder that is reliable and dependable. 

The GTX-320 produces 200 watts of transmission power, offering long range and operation up to 50,000 feet. Plus, the GTX-320 does this without a cavity. As a result, reliability is improved, and no warm-up time is needed before operation. 

The GTX-320 features: 

There are a couple features that ease the installation of the GTX-320, saving you time and money. This Transponder will operate with either 14 V or 28 V, and it does not require a dropping resistor when used with 28 V. 

This is a previously owned item, marked “repairable” when removed for avionic upgrade and includes the panel mounting bracket and connector. The tag indicates it was stamped operational as of 03-29-2018. All knobs and buttons appear to function properly.