These amplifiers often increase the volume of the incoming voice as much as an amplifying handset will. Other kinds of amplifiers fit directly over a telephone earpiece and are held in place by straps. This kind of amplifier extends the earpiece by about one inch. Although it is small, it can usually increase the volume of the incoming voice as much as other amplifying devices. The advantage of a detachable telephone amplifier is that it is portable, and can therefore be attached to a friend's phone, a public phone, or any other phone.
Many detachable amplifiers have adjustable volume controls.
These devices often weigh very little, and are small enough to be carried in a purse or a pocket. A telephone voice amplifier can help a person with a hearing impairment to better understand the incoming voice, but the phone' s ring may not be loud enough to hear. A ring amplifier increases the volume of a telephone's ring so that it is easier to hear. This device plugs directly into a phone jack in a wall, and the telephone plugs into the ring amplifier. Many telephone ring amplifiers have an adjustable volume control that can be set to an individual's preference.