CEStronics CES OMEGA FLEX Assembly And Operating Manual page 43

Battery change for ILS-I internal door handle set
Wide shield replacement handle set ILS-I
1. Loosen the screw of the outside shield.
2. Remove the outside shield. Note that the outside shield must be
removed upwards over the reader unit.
3. Replace the batteries.
Use only Energizer Ultimate Lithium 1.5V AA batteries.
The correct polarity is indicated in the battery compartment
and must be observed.
7.5 Battery replacement
Page 43 of 83