Clear acoustic tube earpiece with 3.5mm listen lead and transducer. The 3.5mm connector will work with most 2 pin 2-way radio audio listen sockets except Kenwood which are usually a 2.5mm listen socket.
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Clear acoustic tube earpiece with 3.5mm listen lead and transducer. The lead is approx 36" long and is fitted with a molded right angle 3.5mm mono jack that will sit "flush" with most socket.
Impedance measured  on Extech …