| Features of SC-CPR230 CPR Manikin Standard airway opening simulation; During chest compression: dynamic barcode displays depth, digital count display, and language prompts. During artificial respiration (blowing): the barcode displays tidal volume, digital count display, and language prompts. Compression and artificial respiration ratio: 30:2 (single or double); Operation cycle... https://www.cqscopelab.com/sc-cpr230-computer-half-body-cpr-manikin