BTE (Behind The Ear) hearing aids is a kind of traditional hearing aid. There are two kinds of tubes for BTE. one is thick and another one is thin tube (often refer to open-fit design). Your BTE comes with one of them. The thick tube should be connected with ear hook and ear tip, including components of 1. Ear Hook, 2. Switch, 3. Trimmers, 4. Volume Control, 5. Battery Door, 6. Thick Tube, 7. Ear tip/Dome. The thin tube should be connected with the ear tip and the brass or silver grooves of the hearing device, including parts of 1. Thin Tube, 2. Volume Control, 3. Trimmers, 4. N-H-O Switch, 5. Battery Door, 6. Eartip / Dome

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