Peace, mercy, and blessings of God be upon you. There are internal hearing aids for both the right and left sides for hearing loss. New, unused. Number of channels: 16 channels, and it is considered one of the strongest channels for sound clarity. The hearing aids are new and unused with all their accessories, suitable for all ages, young and old. And for those with mild, moderate, and severe hearing loss, and it has a programming feature that can be programmed according to the level of hearing loss.