• • Deafness
• • Visual impairment - moderate
• • Visual impairment - severe
• • • Blindness
• • • Deaf-blindness
The operating pressure required to activate a key may be critical for some people.
Unsuitable pressure may result in mis-keying, either through no contact or repeated operation, and it may even lead to muscle spasm where the user cannot readily release the key.
A means of adjusting the return spring pressure or, alternatively, a range of keypads with differing operating forces, is required to meet the needs of these users.
