By pressing the 1-2-3 key, you gain access to the digits 0-9, giving you access to 11 extra keys. Pressing it again will revert to the playback and menu keys.
Number Key Feature
By pressing the 1-2-3 key, you gain access to the digits 0-9, giving you access to 11 extra keys. Pressing it again will revert to the playback and menu keys.