Easy and Efficient 2-Way Rotating display and Auto-Power-Off after 8 seconds when the finger is removed save batteries. Over 30 hours of continuous use on 2 AAA batteries(Not included) Easy to use - A high-resolution display of a large screen can display. Operation of the product is simple, low power consumption, Small in volume, light in weight and convenient in carrying. Fast and precise Rapid measurement, only 6 seconds to measure. It is safe and reliable. It is made using advanced testing and backed by responsive, reliable customer service for a risk-free purchase. Features: ---OLED display: Dual Color OLED display. best show the data. ---Multi-direction display: multi-directional Rotating display. 4 directions, allow you to view your results in any direction. ---long battery life: 1)-low power consumption, working continuously for 6 hours. 2) in the absence of signal, the product will be after 8 seconds to enter the standby state. Specifications: Monitoring parameters :SpO2, Oxyhemoglobin saturation (SpO2) Patient type: applicable to all patients except infants and newborns Measurement range: 36-99% Analytic: 1% Accuracy: between 70% and 99% plus or minus 2% Heart rate pulse repetition rate (PR)BPM Measurement range :30 BPM - 250 BPM BPM solution :1 Precision :1% or 1 BPM Heart Rate: the number of per minute of the Heart,when exercise or emotional excitement speed up! Blood perfusion indicates PI The measurement range is 0.2-30% PI Analytic: 1% Warnings: 1. Please check the direction of the battery. the 2 batteries are in different direction, please do the +/-para right. 2. The finger must be connected to a deep enough, or he can't take the measure 3. Please don't shake your finger or move the body during measurement, or the data maybe unstable. Package contents -1 x Black Fingertip Oximeter (without battery) -1 x Lanyard -1 x English user manual by aviation restrictions, batteries are not included in the package. The battery is not included in the product packaging, you need to install 2 AAA batteries correctly. Do not use the oximeter saturation monitor on infant or neonatal users. The fingertip oximeter is not intended for the treatment, you're advised to go to the hospital for medical treatment and rest more for a healthier body