Regulates airflow and pressure, used with resuscitators or ventilators.

The DVR can be connected to a central gas supply or oxygen cylinder to provide positive pressure ventilation to the patient; once the patient is resuscitated, it can be switched to demand oxygen delivery to ensure all oxygen enters the lungs, preventing gastric distension and vomiting; it is widely applicable in emergency departments, ICUs, and anesthesiology for both non-invasive and intubated treatments. Tidal volume: demand/manual control; Respiratory rate: demand/manual control; Demand flow range: 0–70 LPM; Manual flow rate: fixed at 40 LPM; Airway pressure and audible alarm: 60 cmH₂O (optional 45 cmH₂O); Weight: ≤200 g.