Model : - A2- LK87 Features :- Low voltage indicator - Two-color TFT display, more display modesIt- Small in volume, light in weight, and convenient to carry- Automatically power off in 8 seconds when there is no signal- Low-power consumption, continuously four direction adjustable Specifications :- TFT display- Voltage: DC 3.0V- Low voltage indicator- Pulse waveform display- Fingertip Pulse Oximeter- Screen Resolution: 128*64- 6-direction display adjustable- 8 seconds fast measurement- SpO2 Measuring Range: 0%~100%- Automatic power off when no signal- Display Format: OLED 4 color display- PR Measuring Range: 30bpm~250bpm- Power Consumption: Smaller than 30mA- Power Requirement : 2 x 1.5V AAA alkaline battery *** normal is beep .. beep .. beep *** *** abnormal is beepbeepbeep .. beepbeepbeep ***