Janus Development Group, Inc. fluency products are therapeutic devices designed to dramatically reduce stuttering. They employ altered auditory feedback in the form of auditory delays and frequency shifts to provide maximum benefit to individuals who stutter.

They are adjusted to fit in or behind the ear, and are worn like traditional hearing aids.

The most noticeable benefit is the remarkable reduction or elimination of stuttering in a short period of time. Once the individualized prescriptive settings are determined, usually within 20 to 90 minutes, the fluency effects are instantaneous. Other benefits include improved levels of confidence when using the device, as well as cosmetic appeal. The device has no cumbersome equipment, and is virtually unnoticeable when worn in the ear canal.