Receiver placement and removal:1. Place each Sontro OTC Hearing Aid over the corresponding Left and Right ear so the body of the hearing aid is behind the ear.2. Hold the receiver where it bends and gently place/push the dome into the ear canal. Push the ear dome far enough into the ear canal so that the thin tube lies flush with your head. (check in the mirror)NOTE: If the receiver does not lie flat against the side of your head, you may need a larger or smaller size. Please contact customer support to exchange the size of your receiver.3. To remove the hearing device, hold the receiver tube where it bends and remove the ear dome from the ear canal.Ear dome replacement and removal:We are all different, and so are the shape & size of our ear canals. Included in your purchase, you will find a package of ear domes in different shapes and sizes.We recommend you take the otoTune 3-minute hearing test with the Tulip ear domes installed on your hearing aids. We suggest you wear your Sontro OTC Hearing Aids for a couple of hours before making a final decision on ear dome fit for everyday use.Occasionally, people have left and right ear canals that are of different sizes and shapes. If this is the case for you, you may find you need one size in one ear and a different size in the other ear. Use what feels best for you!To change your ear dome:1. Firmly grasp the receiver where it bends and pull off the ear dome.  Be careful to hold the ear dome by its base so as to not rip the ear dome when pulling away the receiver.  2. With a clean, dry cloth, remove any wax build-up from the end of the receiver.3. Holding the new dome in your hand, place the receiver into the small hole in the middle of the new ear dome.4. Push firmly to make sure the new dome is attached securely.