5 select the color theme (handset only), 6 set the display contrast, 7 set the backlight time (handset only) – Philips SE6581B-17 User Manual
Page 51: 8 deactivate/activate auto hang-up (handset only), Select the color theme (handset only), Set the display contrast, Set the backlight time (handset only), Deactivate/activate auto hang-up (handset only)

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