Indicators:Tron SART20 is equipped with an LED and a built in buzzer to indicate operation. The LED will normally give a flash each 4 seconds to show that the Tron SART20 is activated.When a search and rescue unit is approaching the buzzer will sound each time the SART20 is hit by the radar. A continuous sound from the buzzer means that the ship or helicopter is close to the Tron SART20 and the radar is hitting the Tron SART20 continuously.
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