Pulse Oximeter with Neck / Wrist Strap Features a digital readout of blood oxygen saturation (up to 99%), pulse in BPM, pulse detection strength, and low battery warning Easy, one-button operation thats accurate within 2% tolerance Lightweight, compact, and portable. For pediatric to geriatric users. Operates on (2) AAA batteries. Low power consumption allows for up to 24 hours of continuous use. Includes carrying case with belt loop and detachable lanyard strap. Intended for sports and aviation users only