Tait TM8100 Guide De L'utilisateur page 17

Getting started
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This section provides a brief description of your radio's
basic operation. If you need further information, contact
your radio provider.
Radio controls
The radio controls are the PTT key, volume control, on/off
key, channel selection keys and function keys. Some keys may
have functions assigned to both short and long key presses:
The radio controls and their functions are summarized in the
following diagram.
12 Getting started
a short key press is defined as less than one second, and
a long key press is more than one second.