Check the listing for details. Phonak Size 0 Standard Strength Left Receiver 4.0 0L For Marvel Hearing Aids#90. Condition: New. Listed at 29.99 USD. Phonak Size 0 Standard Strength Left Receiver 4.0 0L For Marvel Hearing Aids#90 NEW ITEMPACKAGE IS SLIGHTY DAMAGED This listing is for 1 brand new never used Phonak Marvel speaker / Receiver. Side: Left Length: Size 0 Strength: Standard Power (S).This receiver is only for Phonak Marvel hearing aids. They are NOT backwards compatible to older models as they have a 3 prong connection. Likewise older speakers with a 2 prong connection will not work with the new Marvel line of hearing aids.These new speakers are an upgrade to the older 2 prong connection. They have 3 different strengths (Standard, Medium and Power) and they use 4 different types of domes (Cap, Open, Vented and Power) in 3 different sizes (Small, Medium and Large) all of which can be found in our eBay store. COMES AS PICTURED 30 DAYS WARRANTY PICTURES ACTUAL ITEM SHIPPING NO.PO.BOX ALL ITEMS ARE SHIPPED THE SAME DAY VIA FEDEX OR UPS AT OUR DISCRETION, CONTACT US FOR SHIPPING QUOTES TO ALASKA, HAWAII, AND US TERRITORIES. THANK YOU FOR VIEWING THIS ITEM!