High Quality Portable Digital OLED Fingertip SpO2 Pulse Oximeter BX-22 Features: -OLED display: Dual Color OLED display. Better shows the data. -Multi-direction display: Rotatable multidirectional display. 4 directions, 6 modes, allow you to view your results in any direction. -Alarm function: Set the alarm and beep according to your needs. There will be a warning once the measured values go beyond the setting. Know it immediately. -With case: Small in volum, light in weight, convenient to carry. With a landyard and carrying case, convenient to use and to storage -Long battery life: 1) Low-power consumption, continuously work for 6 hours. 2)In the absence of signal, the product will be in after 8 seconds to enter standby state. Specifications: SpO2: Measurement range: 70~99% Resolution: 1% Accuracy: +/- 2% (70%~99%), unspecified (