NOTE: 3 PRONGS!! **** NOTE: that shipping tracking is delayed and handing at post office is out of my control as a seller.****NO RETURNS. INTERNATIONAL SHIPPING AVAILABLE.** EXPEDITED SHIPPING OPTIONS AVAILABLE AT CHECKOUT. HOWEVER, CANNOT BE GUARANTEED. The only guarantee is that package will be packed and dropped off immediately after checkout with the shipping label of your choice. LEFT AND RIGHT RECEIVERS SOLD SEPARATELY. Replacement for Phonak Marvel / Unitron Discover 4.0 Receiver Wire. This will not work on older generation Phonak hearing aids. Included in this pack are 1 x small/medium/large open domes and a retention pin.Comes in three different power levels: Standard (S), Medium (M), Power (P) and three different lengths: 1, 2, 3These are original receivers from Phonak. What’s Included? 1 x Phonak SDS 4.0 ReceiverCondition This item is brand new in box, never opened. Comes with all original accessories. Original product directly from Manufacturer. The length of the receiver wire is usually printed as a tiny number near the top of the receiver where it attaches to the hearing aid. To check that you need to order an ‘S’ type receiver, a small red or blue ‘S’ will be printed onto the white casing of the receiver component itself (you may have to remove the dome to see it).If you are unsure as to which size you need, please contact us and we will do our best to help you.Please note that the domes are NOT included with the receiver tube and must be ordered separately. The range of compatible domes can be viewed in the ‘related items’ section on this webpage.Whilst it is a fairly straight-forward process to change the S receiver tube, please ensure you are able to remove and replace your receiver tubing yourself before purchase. Feel free to ask any questions before deciding what you need. * if ordered before 7 PM est on a weekday.** international orders will take longer to arrive. By purchasing this, you agree to the following:- I understand that Happy Hearing cannot be held responsible for any damage to hearing aids during the replacement process.- I have been granted a prescription, by a licensed hearing healthcare professional, for hearing aids and this particular receiver length and power. – I have made sure that I am ordering the correct item and understand that it cannot be returned.