Features1、One button operation, optical sensor technology, 10 second fast measurement. 2、Clear OLED display, four directions, convenient reading effect. 3、Clearly displays blood oxygen and heart rate with high accuracy. 4、Automatic shutdown in 8 seconds, energy saving and environmental protection. When the alarm value is reached, the number displayed on the screen flashes. 5、With a lanyard, it can be portable for family or traveling.SpecificationColor: blue and whiteMaterial: ABSDisplay Type: OLED DisplaySpO2 measurement range: 70% -90%SpO2 Accuracy: ± 2% at 80% -99%, ± 3% at 70% -79%SpO2 resolution: ± 1%PR measurement range: 30 BPM-240 BPMPR accuracy: ± 1 BPMAlarm function: flashing numbers (SpO2> 100, SpO2 130, PR ＜ 60)Battery: 2 x 1.5V AAA batteries (not included)Working current: 2.5mAWorking conditions: 5 ℃ -40 ℃, relative humidity 15% -80%, 70kPa-106kPaProduct size: 55 * 30 * 32mm/2.2 * 1.3 * 1.2inProduct weight: 26g/0.9ozPacking size: 8 * 6.7 * 4.7cm/3.1 * 2.6 * 1.9inPackage Weight: 43g/1.5ozPackage included:1 * Finger Pulse Meter (Button color random)1 * Lanyard1 * User Manual (English)Package List1 x Finger Pulse Meter (Button color random)1 x Lanyard1 x User Manual (English)