Technical specification 1. Display mode: color display. 2.Blood oxygen saturation: measure range: 70% ~ 99% measure accuracy: ± 2% in the range of 70% ~ 99%,≤70%, undefined accuracy identification rate: blood oxygen saturation ± 1% 3.Pulse rate: measure range: 30BPM ~ 240BPM Measure accuracy: ± 2BPM or ± 2% of the measured value ( take larger value). 4.Battery model: 2 AAA 1.5V alkaline batteries. 5.Power consumption: less than 30mA. 6.Automatic shutdown: when no finger is inserted, it will shut down automatically after 10 seconds. 7.Dimension:58mmx32mmx34mm 8.Use environment: use temperature: 5ºC~ 40ºC. Storage temperature: -10 ºC ~ 40 ºC. Ambient humidity: 15% to 80% when working 10% to 80% storage. Atmospheric pressure: 70kPa ~ 106kPa. 9.Pulse wave measurement sensitivity under weak perfusion conditions: The required test equipment (BIO-TEK INDEX Pulse Oximeter Tester) can measure available pulse wave signals with an amplitude of 6% of the amplitude of the analog pulse wave signal. 10.Anti-interference ability of ambient light: use BIO-TEK INDEX Pulse Oximeter Tester to apply interference signal test, the instrument can work normally. Maintenance and storage When the low voltage light is on, please replace the battery immediately. Please clean the surface of the oximeter before using it for patient. Remove the battery inside it if you do not use the blood oxygen meter for a long time. This product is best stored at an ambient temperature of -10ºC to 40 ºC ( 14ºF-104ºF ) and humidity at 10% to 80% This product must always be dry, wet surroundings may affect the life of this product or even damage this product Please handle used batteries in accordance with local government laws and regulations. Product accessories User manual--1Pcs Lanyard---1Pcs Warranty Card---1Pcs