Our hearing aids headphones is not through eardrum, but through the skull, which will not aggravate the hearing loss of the elderly. Meanwhile, the product is not in the ear, so it is more comfortable for the elderly to wear.Specification:Music Play Time: 12 hours.Battery Capacity: 350 mAh.Charging Time: 2.5 hours.Colour:Black.Package:1 * Bone Conduction Hearing Headsets Earphones.1 * Receiver.1 * Charging Cable.1 * Instruction manual.Note:If not use the headphone foe long time.suggesting charging it once a month to keep battery life.