Sangean RCR-10 (R3) - Manual (Page 13)

GB
Remote control functions
Many functions of the RCR-10 clock radio can be operated using the
remote control. Some operations require a longer press of the button.
In this case simply keep your finger held on the remote control button
for 2-3 seconds until the display on the radio shows that the command
has been accepted.
Before the first operation: please remove the small transparent foil
from the battery holder to activate the battery.
Remote control battery replacement
1. Open the battery holder by pulling the holder out in direction shown.
2. Remove battery from holder.
3. Replace battery (CR2025 or equivalent) ensuring that the positive side
of the battery faces you with holder positioned as shown.
4. Replace the battery holder.
IMPORTANT:
The batteries should not be exposed to excessive heat such as sun-
shine, fire or the like. After use, disposable batteries should if possible
be taken to a suitable recycling center. On no account should batteries
be disposed of by incineration.