1、Prevent Earwax Accumulation: Water and oil resistant filters prevent earwax or moisture from getting trapped inside, helping to maintain stable performance of hearing amplifier. 2、Applicable Models: Especially suitable for Oticon hearing amplifier, easy to install and replace, helps prolong the service life of hearing amplifier. 3、Wax Filter Replacement: Wax guard filter is used to replace the original wax filter on the hearing amplifier, multiple wax filter are available, satisfy your replacement needs. 4、Hearing Amplifier Accessories: Important and necessary accessories for the elderly and hearing impaired people, adopts ABS material, firm and stable, durable for use. 5、Portable Design: Light weight and in small size, easy to store and carry, can be easily put into your bag, perfect for home, travel, office work, etc.