100% Brand NewOperation Instructions1.Install two AAA batteries into battery cassette before covering its cover.2.Plug one finger into rubber hole of the Oximeter (it is best to plug the finger thoroughly) before releasing the clamp with the nail upwards.3.Press button on the front panel;4.Donot tremble your finger when the Oximeter is working. Your body is not recommended on moving status.5.Press the button on the front panel、 if we want change display direction;6.Read relevant datum from display screen.7.If there is no signal input、 oximeter can shut off automatically;8.Please replace new batteries when OLED indicates the batteries are in low power.Detailed descriptions of product functions1.Display Type:Two colors OLED display2.with beep sound3.SpO2:Measurement range:70~99Accuracy:??2% on the stage of 70~99、Unspecified(??70) for SPO2Resolution:??1%4.PR:Measurement range 30BPM~240BPMAccuracy:??1BPM or ??1%(the larger one)5.Power: two AAA 1.5V alkaline batteries6.Power consumption:below 30mA7.Automatic power-off:the product shuts off by itself when no finger is in the product in 8 seconds8.Dimension:62mm??32mm??33mm9.Operation Environment:Operation Temperature:5~40Storage Temperature:-10~40Ambient Humidity:15%~80% on operation10%~80% in storageAir Pressure: 70kPa~106kPa10. Declaration:EMC of this product comply with IEC60601-1-2 standard.11. Measurement Performance in Low Perfusion Condition:required test equipment (BIO-TEK INDEX Pulse Oximeter tester) could measure the available pulse wave with the amplitude of 6% of the simulation pulse wave amplitude.12. Interference Resistance Capacity against Ambient Light::Device works normally when BIO-TEK INDEX Pulse Oximeter tester exerts interfering signal test.Package Content:- 1 x Fingertip Oximeter- 1 x Lanyard- 1 x English user's manual