Features ?Integrated with regular stethoscope, ECG waveform display,heart and pulse oximeter ? Large LCD screen display: 160 x 96;LED back light ? RS232 interface connection to computer ? Changeable Spo2 sensor for different patient (neonate,infant,enfant,and adult) ? Freeze function:convetient to observe the hear rate, ECG and SPO2 ? Real-time display of the hear rate,ECG and Spo2 ?Low power consumption,Long lift battery ?Spo2 is option Specification ?Weight:200g ?Power:3.6v(Li-ion);Current:d 20 MA ?Operation :about 40 hours ?Automatically switch off:The switch will be off automatically in four minutes while no date input ?LCD Display: Pixel 160 x 96 ?Display Zone 60 x 34mm ?ECG Waveform Rolling Speed:6.25mm/s 1.25mm/s 25mm/s ?Sensitivity: Automatic