Hkoenig SWRC110 Manuel D'instructions page 8

Note:
A. Install two AAA type batteries into the remote control before use,
B. The big round button in the middle of the 4 direction buttons, is a blank button without any function.
C. Remove the batteries if the remote control will be left unused for a long period.
D. If you use the remote control near the charging station, the robot may not recognize the command
and may not work.