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             LED Radio-Controlled Clock WS 6840 

Key Features: 

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DCF-77 radio controlled 

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 12/24 H display. 

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 Time zone setting: -12 to +12 Hour. 

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 Dual Alarm with snooze function 

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 Indoor Temperature display in °C/°F 

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 Outdoor Temperature display in °C/°F 

 

Power on or Reset: 

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 After power on or Reset, all LEDs turn on accordingly, buzzer beeps, unit enter RF Searching mode for Max. 3 

minutes, then exit RF Searching mode and enter normal mode. 

Clock setting: 

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 At normal mode, Press and hold the “

MODE”

 key more than 2 seconds, can set 12/24HR 

Æ

 Hour 

Æ

 Minute 

Æ

 

Offset time. 

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 Corresponding icon flash at 1Hz, and press “

UP

” or “

DOWN

key to set the value, and hold “

UP

” or “

DOWN

key for 

fast increasing or decreasing. 

`

 Press “

MODE” 

key to confirm the setting and come to next setting, unit will return to Normal Mode after finish 

setting. 

F.Y.I.: 

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 At any other mode, if without key operation for 15 seconds, the unit will store current setting and return to Normal 

Mode automatically. 

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 How to set 

Offset Time

 : Offset time means the time different between local time and Germany time; If local time is 

1 hour faster than Germany time, then set the offset time to +1HR; If local time is 1 hour slower than Germany time, 

then set the offset time to -1HR; Unit’s clock will automatically set to local time after receiving DCF signal 

successfully. 

     

Alarm Setting: 

`

 At normal mode, Press “

Mode”

 key to toggle the display among Clock 

Æ

 AL1 time 

Æ

 AL2 time, When AL1 or AL2 

time be displayed ,press and hold “

Mode”

 key more than 2 seconds to set Hour & Minute, corresponding icon 

flash at 1Hz. press “

UP

” or “

DOWN

  key to set the value, and hold “

UP

” or “

DOWN

key for fast increasing or 

decreasing. 

`

 When AL1 or AL2 icon flash, Press “

Down” 

key

 

to enable(Corresponding Alarm LED turn on) or 

disable(Corresponding Alarm LED turn off) alarm. Unit will return to normal mode after finish setting 

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 Alarm sound crescendo for 2 minutes. 

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 During alarm, press “

SNOOZE

” key to stop the alarm and enable snooze function (Corresponding Alarm LED flash 

at this status), the unit will alarm 5 minutes later.   

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 During alarm or Snooze function enable, press any other keys except “

SNOOZE

” key, will cancel the alarm or 

Snooze function. 

Indoor Temperature Measurement: 

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 Indoor Temperature measurement range: -9°C ~ +49°C, “

LLL

” will displayed if value lower than -9°C, “

HHH

” will 

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