Dynex OPSYS MW 91000051 - Manual (Page 33)

The Keypad
Key Purpose
Alphanumeric
Keys
The numeral shown on the key is displayed by
pressing the key once. If the key is pressed two to
seven times rapidly, one of the letters on the key
will be displayed. The letter that is displayed
depends upon the number of times the key is
pressed.
Opsys MW™ User’s Guide 25