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Rainbow4(S) IP Phone User Manual
Backlight
Backlight is the brightness of LCD, also it has been defined as 9 different grades.
The number "9" means the lightest.
To adjust the brightness of LCD expansion module, it must be connected with the
hosted phone. Otherwise the host phone will indicated "No expansion module" .
3.4.8、Application
ATCOM TECHNOLOGY CO., LIMITED
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www.atcom.com.cn
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