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By certification 
Model Number: SC-MST-MT300BS-3.5
Type: Listen only air tube earphone
Connectors: Two way radio jacks
Use: Fit two way radios
Function: Noise cancelling
Color: Black
Spec.&Feature:
-- Idea for covert operations, speaker microphones or more.
-- 2.5mm and 3.5mm plug can be optional.
Type: Listen only air tube earphone
Connectors: Two way radio jacks
Use: Fit two way radios
Function: Noise cancelling
Color: Black
Spec.&Feature:
-- Idea for covert operations, speaker microphones or more.
-- 2.5mm and 3.5mm plug can be optional.
