Retention locks for Phonak 4.0 Receivers used on Marvel and Paradise Audeo hearing aids. Retention Locks help the receiver stay in place and helps prevent the hearing aid from falling out. Retention locks loose there stiffness over time and it
Retention locks for Phonak 4.0 Receivers used on Marvel and Paradise Audeo hearing aids. Retention Locks help the receiver stay in place and helps prevent the hearing aid from falling out. Retention locks loose there stiffness over time and it