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The C101199-05 from Otto Acoustic Engineering is a 5-pack of acoustic tubes with clear eartips, designed for use with the Otto IFB earphone. It provides clear transmission from a communication radio into the ear, and has a discreet behind-the-ear loop design.
In the Box
Otto Engineering C101199-05 Acoustic Tube with Clear Eartip for IFB Earphone (5-Pack)