This listing is for a Telex Aviation Headset Tester. Please note that this unit is being sold strictly as NON-FUNCTIONING / FOR PARTS OR REPAIR. It may have internal electrical faults, missing components, or require significant troubleshooting to return to a working condition. This is an ideal project unit for avionics bench technicians, electrical engineers, or repair shops looking for salvageable internal parts, housing enclosures, or a repairable piece of aviation communications test equipment.