Phonak & Unitron HE11 BTE hearing aid earhooks

Phonak HE11 hearing aid earhooks have a ''female" screw fitting onto the hearing aid - see illustration below. They are available in standard or mini sizes in a range of colours. A 680 suffix indicates that it has an acoustic filter, there are also tamperproof options for paediatric use.

The acoustic filter is a small white blob inside the earhook near the tip, it is difficult to see in photographs but you can if you hold it up the the light.