Quick, Accurate Readings – Measures blood oxygen saturation (%SpO2) and pulse rate (PR) in seconds with advanced dual LED technology Clear Digital Display – Bright, easy-to-read screen shows real-time oxygen and pulse data with user-friendly controls Portable & Lightweight – Compact design fits in your pocket or bag, perfect for home, travel, or on-the-go use Battery Operated – Runs on 2x AAA batteries (not included), giving you freedom to use it anywhere without cords Easy To Use – One-button operation and fingertip sensor make it simple for anyone to check vital stats at home