Redback A 4505 Operating Manual page 9

Redback® A 4505 Lockdown Timer
Step 3: Open the folder to change, in our example the
"bell" folder, and you should get a window that looks
like figure 2.2.
Fig 2.2
Step 4: You should see an MP3 file "Schoolbell.mp3".
This MP3 file needs to be deleted and replaced by the MP3 file you want to play when you activate the bell. The MP3 file
name is not important only that there is one MP3 file in the "bell" folder. Make sure you delete the old MP3!
Note 1: MP3 files should have the following specifications for optimum performance.
128kbps, 44.1kHz, 32bit, VBR or CBR, Stereo (even better as mono).
Note that the new MP3 file cannot be "Read only". To check this right click on the MP3 file and scroll down and select
Properties, you will get a window that looks like figure 2.3. Make sure the "Read Only" box has no tick in it.
Repeat these steps for the other folders.
The new MP3's are now installed on the SD card, and the card can be
removed from the PC following windows safe card removal
procedures. Make sure the A 4505 is OFF and insert the SD card into the
SD card slot ; it will click when fully inserted.
The A 4505 can now be switched back On. If all the MP3 files are OK
then the unit will display the time screen. If an MP3 error message is is
displayed, there is a problem with one or more of the MP3 files.
Fig 2.3
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