This compatible sensor connects directly to the bedside monitor. It works with the following patient monitors: Alaris 4415 (IVAC): VitalCheck 4400, 4410; Criticare: 503DX-W, 503S, 503DX, 503 Spot, 504DX/P, 504DX, 506 series (except 506LN3), 507ELC2, 8000 series, 8100 series, Poet Plus, Poet R Plus, Poet (602-3A), Scholar, Scholar III, nCompass, nGenuity,9-foot cable.