SuitableONLY for Phonak Audeo M, P and L RIC hearing aids (Marvel, Paradise and Lumity), Unitron Discover, Discover Next, Blu and Vivante RIC hearing aids, also Specsavers Advance x39, x70 and x71 (x representing the technology level ie a 3 digit number ending in 39, 70 or 71) that are usingSDS4 receivers wires.
