The Span America-3400 Control Unit is the specialized digital pump designed to operate the Protocol therapeutic mattress system. It offers a sophisticated microclimate management system that utilizes alternating pressure and powered flotation to treat and prevent Stage I-IV pressure injuries. Unlike high-output blowers, this unit operates with significantly less heat and noise while consuming minimal power. Its "Auto Firm" mode provides a stable surface for transfers and activities of daily living, automatically reverting to treatment mode after 20 minutes to ensure continuous patient care.