Product Feature: Sports : Ideal for sports enthusiasts such as hikers, skiers, bikers, The pulse oximeter's OLED display faces the user for easy reading. Accommodates A Wide Range of Finger Sizes: Finger cavity is equipped with an intelligent spring system. Suitable for ages 12 and up. One-button Opration:Simple to operate, you can press the button to measure anytime, anywhere, especially to measure before exercise, Specifications: Material: ABS Color: Black Power by: 2xAAA Battery (not included) Package Included: 1 x Fingertip Oximeter for Sports 1 x Instruction Manual 1 x Portable Lanyard