How to adjust the sounder on the D625 and the D623 keypads

 Use the following steps:

1. Press [CMD][4][9].
2. Enter passcode.
3. Press and hold [*], and then press [1] or [4] to adjust volume.
4. Press and hold [*], and then press [3] or [6] to adjust display brightness.
5. Press [CMD] to exit the function