Uniden DTL-8R-1 User Operation And Specification page 21

2) When the Handset is on charge, all Function LEDs will keep status even if it matches
above condition.
3) If the user presses any key (include no valid key) or the user pick up the Handset from
cradle or the user puts the Handset on cradle, LCD/Key Back Light is turned on.
LCD/Key Back Light will be turned off after 10 seconds When no operation.
4) LCD/Key Back Light is turned on during incoming call mode.
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