b'HOW DO I KNOW IF THENP SIMS IS WORKING?TheNP SIMS is a silent system and has no audible alarms. TheNP SIMS is functioning and active when: 1. Dressing feels firm to touch and has a flattened, wrinkled appearance. In addition, the contour of the incision may be visible.2. Blue sealing flap on top of vacuum chamber isdepressed into the top of the vacuum chamber with white grid lines visible.NP SIMS Patient and Caregiver Instructions (PCI)5'