A cushioning device for use with a hearing aid instrument for positioning in the ear of a user is disclosed. The cushioning device comprises a ring volume that encircles a predetermined portion of a hearing aid housing and separates the hearing aid housing from an ear canal of a user. A pliant substances is disposed within the ring volume and a reservoir which is in fluid communication with the ring volume in a manner permitting bi-directional flow of the pliant substance between the reservoir and the ring volume.

 
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> Portable equipment for measuring and/or monitoring the heart rate

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