Lithium battery ,Power Consumption : <30mA,Working time :more than 5 hours,automatically power off; Charging time : 2.5 hours;Stand-by time: 48 hours, 44mm*28.3mm*26.5mm 20.2g ( battery included ) Dual color OLED displays SpO2, PR, , waveform, Pulse bar; 4-direction & 6-mode display provide convenient readings; Setting alarm range of Spo2 and pulse rate Menu- function setting (Beep sounds, etc) Gravity function, Automatic rotating read (Option) PI- Perfusion Index indication (Option)