Sangean RCR-4 (V1) - Manual (Page 17)

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Sleep timer – radio auto shut off
The Sleep timer can be set from 15-120 min. The radio will be
switch off after the time you set has elapsed.
1. Touch and hold the POWER key for more than 2 seconds,
until the required time period is shown on the display.
2. When the time is counting, touch INFO key to check the time left.
Time zone setting
Set TIME ZONE switch (on the bottom of the radio) to 0 position
for regular case.
For some countries where don’t provide radio controlled time
facility but able to receive radio controlled time signal from nearby
countries and the time zone is different, you may use the
TIME ZONE switch to correct the time.
For example, in Turkey which is one hour ahead of Central
European time but still can receive radio controlled time signal from
Germany (Central European time), you may use this TIME ZONE
switch to (+1) to correct the local time.