Philips 40PFL8664H User Manual page 44

2.1.2 Batteries
Open the battery cover on the back of the remote control
to insert the 2 batteries supplied (Type AAA-LR03-1.5V).
Make sure the + and - ends of the batteries line up
correctly (+ and - are marked inside).
Remove the batteries if you are not using the remote
control for a long time.
Dispose of batteries according to the end of use directives.
Read Get started > Important > End of use.