All I required was the O ring that holds the diaphragm in place, but had to buy an entire kit to get it. Was disappointed that the ear pieces only come in small which is not my size, subsequently a very expensive purchase & postage for a simple inexpensive item. AMA service was very good & shipping was very fast.
Very happy with speed of delivery. Item perfect. All fitted and being used by my daughterinlaw at the moment for listening to 20 weeks + foetal heart while no face to face midwife visits allowed due to COVID 19.