[RELIABLE]We will never use any cheap material to make oxygen monitor.From the ABS shell, LED screen, acrylic panel, high-speed computing chips , anti-skip silicone inside, medical-grade silicone finger mold and various electronic components of oxygen finger monitor, all adopt high-quality materials and components. Even the spring of the oximeter finger has been subjected to thousands of tests. [ACCURATE] The fingertip pulse oximeter deviates less than 1 percent under lab conditions. Upgrade LED and sensor allows SpO2 (Blood Oxygen Saturation level) and pulse rate measurement at low blood perfusion index. Plethysmograph and Perfusion Index can help you to judge whether your measured SpO2 and Pulse Rate is properly. [24 MOTHS WARRANTY]24 months of manufacturer warranty. If the product has quality problems, please contact the seller for free replacement via Amazon Mail. [Easy to use]Alarm function-Auditory alarm to warn you when your SpO2 and Pulse Rate are beyond set limits. The pulse oximeter fingertip automatically turns off 6-8 seconds. Include 2X AAA BATTERIES that you can use the pulse oximeter right out of the box,a LANYARD for convenience. [Bright OLED Screen]The large Dual-Color OLED screen is large and bright, you can read SpO2 and pulse rate clearly even in strong sunlight. The finger oximeter designed for sports or aviation use like mountain climbers, skiers, bikers or people interested in measuring their SpO2 and pulse rate. Oxi finger chamber with smart spring system, accommodates wide range of finger sizes – children over three year old to adult.