SilverCrest SPO 55 Mode D'emploi Et Consignes De Sécurité page 24

Clean the contacts on the battery and inside the battery compartment before insert-
ing!
Immediately remove drained batteries from the product.
Do not use rechargeable batteries.
Initial Use
Verify the parts listed in the scope of delivery are complete.
Remove all packaging material.
Inserting / Replacing Batteries
Slide the battery cover open (Fig. C).
4
Insert the two included batteries (with the correct polarity) in the pulse oximeter
(Fig. D). Please note the marking inside the battery compartment.
Close the battery compartment (Fig. E).
4
24 GB/IE/NI