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For discreet communication, the Acoustic Tube with Quick Disconnect by OTTO is a good professional choice. It can be used in several environments with 2-way radios for applications such as security, hotel personnel, event coordinators, retail stores and more. The acoustic tube has a quick disconnect attachment, and is designed to be used with a one or two wire OTTO loc surveillance kit, (sold separately).
In the Box
Otto Engineering Acoustic Tube with Quick Disconnect