Phonak & Marvel Medium Retention Tail for and similar items

Additional Details ------------------------------ Product description: Retention Tail for M receiver SDS 4.0. Will not fit Small or Power Receivers. This is for 4 retention tails. This will fit Marvel and Paradise Ric Products. Receiver Retention Key Notes: There are 3 different receiver powers. S- Standard Power, M-Medium power, P- Power, Therefore, there are 3 different size options for retention locks. S, M and P which can also be referred to as Small (S), Medium (M) or Power (P). Look at the metal part of the receiver wire. There will be a stamp in red or blue showing a number and then a letter. Examples: 2S, 2M, 3P. The letter is the power of the receiver, which you would want to match the retention lock to. All of the information posted here is 100% correct. Sold by Hearing Depot Online Store.