Alice & Law ATS 4121CL - Manual (Page 20)

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4) Enable key click by pressing 1 or ▲, or disable key click by pressing 0 or DOWN.
KEY CLICK
OFF
5) Press PROG to confirm the setting. The display will return to:
>KEY CLICK
KEY LOCK
Note: 1) Key Click is On by default; and 2) Key Click is disabled when the key lock is ON.
Key Lock
It is possible to lock the Handset keypad. The key lock function is set/reset by:
1) Press PROG.
>CALL LOG
PHONE BOOK
2) Press the ▼ key seven times.
>KEY LOCK
HANDSET NAME