When "Level Locking" is engaged the SNOO will not advance beyond the level that it is locked on. SNOO will not escalate if the baby cries. Level 4 (orange) cannot be locked.
How to engage Level Locking
Advance the SNOO to the desired level or allow SNOO to advance on its own based on the babies cries, the press and hold the Activity Button in the app. Hold for approximately 5 - 8 seconds. The lock icon will appear.