Product operation scope : The fingertip oximeter can be used to measure human hemoglobin saturation and heart beat through finger. The product is suitable for use in family, hospital (including clinical use internist/surgery, anesthesia, pediatrics, intensivecare and etc), oxygen bar, social medical organizations, physical care in sports (it can be used before or after sports. Continually monitoring is not commended). Technical parameters: Display format: led spo2:35-99% in two-digit 7-segment digital;pulse ratio:30-240bpm in 3-digit 7-segment digital;pulse wave: 6-segment bargraph;battery voltage low indication: led signals.-fff Power requirements: two aaa size 1.5v alkali battery;ffff Power consumption: less than 40ma.-f Resolution: f+1% for spo2 and f+1 bpm for pulse ratio. Measurement accuracy: f+2% in stage of 70%-99% spo2 and meaningless when stage being smaller than 70%. -+2 bpm for pulse ratio. Measurement performance in weak filling condition: oxyhemoglobin and pulse value can be shown correctly when pulse-filling ratio is 0.5%. Interference resistance capacity against ambient light: deviation is smaller than f+1% between value of oxyhemoglobin measured in natural lighting indoor condition and present lighting sources and that measured in dark room. Product properties : Operation of the product is simple and convenient.-fff The product is small in volume, light in weight (total weight is about 50g including batteries) and convenient in carrying.-fff Power consumption of the product is low and the two originally equipped two aaa batteries can be operated continuously for 30 hours.-fff Low voltage warning will be indicated in visual window when battery voltage is so low that normal operation of the oximeter might be influenced.-fff The product will automatically be powered off when no signal is in the product for more than 8 seconds. Suitable for adult and pediatric patient 0.15kg/pc