JRENUM® Plus: With Exchangeable Filter Technology Acoustic Selective Hearing Protectors This sophisticated design allows the client to exchange the filter type, providing the best protection for each individual noise environment. transparent and discrete transparent, coloured and with fancy stones JRENUM® Plus: A Hearing Protector With Exchangeable Filter Technology   The filters are embedded in a plastic carrier that can then be inserted into the hearing protector, and can be easily changed by the user. To clean the hearing protector, just remove the filter and clean the outer protector according to the instructions. Easy to handle, easy to clean, easy to change.