Philips AJ290/12 User Manual page 10

To install batteries into the main unit
1
Open the battery compartment.
2
Insert 4 AAA batteries (not supplied) with correct polarity
(+/-) as indicated.
3
Close the battery compartment.
To install batteries into the sensor
1
Open the battery compartment.
2
Insert 2 AA batteries (not supplied) with correct polarity (+/-)
as indicated.
3
Close the battery compartment.