Start working 1)Wear the sensor on thumb finger, index finger as option in case of too tight for thumb. Try to move the sensor along the forefinger to find out a best fit. Avoid being loose. Loose wearing causes inaccurate measure. 2)Device will turn on automatically. After a few seconds, the device will begin to monitor. Download App App name: ViHealth Notice: if you have installed the App before, please update it to the latest version. PC software PC Software: O2 Insight. Install the software on Windows(win 7/8/10) or MacOS(10.13 or above). With the optional PC software, you can view and print sleep report, which can also be exported as PDF or CSV files. Specifications Weight： 31g (main unit with band and sensor) Size ： 49×27×14 mm (main unit) Battery： 3.7Vdc, Rechargeable Lithium-polymer Charge time： 2-3 hours Battery life： 16 hours for typical use O2 level range： 70% to 99% O2 Accuracy (Arms)： 80-99%:±2%, 70-79%:±3% Pulse Rate range： 30 to 250 bpm Pulse Rate accuracy： ±2 bpm or ±2%, whichever is greater Vibration： Triggered by low O2 level Recorded parameters： O2 level, Pulse Rate, motion Data storage： 4 sessions, up to 10 hours for each
