Display screen:10.1 inch screen Gas source:O2,N2O,AIR Vaporizer: 2pcs Flowmeter: 5 tubes flowmeter Back-up battery:Up to 3 hours Ventilation modes: VCV/AC/SIMV/PCV/PSV/Manual Waveforms : P-T,F-T,V-T,loops of P-V,V-F,F-P Tidal Volume:20-1500ml ACGO available to connect with T/Bain circuit for open operation.