Small size, portable, lightweight, easy to carry. Accurate measurement data, read data within 5 seconds. One-button operation, simple and convenient. Sound and light alarm to remind abnormal data in time. Multi-directional screen display. Automatic shutdown, energy saving. Notice: Color is random. Suggest a color from those offered, we will send if it is in stock. If not, we will send the one we have. Please allow 1-3cm deviation due to manual measurement Specification: Size: 62x32x33mm Screen: OLED color screen Blood oxygen saturation: the measuring range is 36% -99% Measurement accuracy: 90% (error is less than 2%) Resolution: blood oxygen saturation ±1% Pulse rate: measuring range 30BPM-250BPM Error is less than 1% Product power consumption: less than 30MA Use two AAA batteries (Not included) Package Includes: 1 x Oximeter NOTE: Actual brand and appearance may vary.