Big Button Phones
Big button phones are ideal for elderly people. Not only do they have easy to see and press giant buttons they also tend to have a louder ring tone and speaker/hands-free facility. Ideal for anyone with any degree of sight loss or struggling with manual dexterity due to arthritis.
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This is one such example available from Amazon and the BT Big Button Corded phone. Most of the elderly people I have supported including my Mother in Law who had severe sight loss used this phone. It has a lovely tactile feel to it and has the additional facility of an extra- loud ringer.