ACCURATE READINGS, RELIABLE RESULTS¬–Illuminated red digits clearly show results, and offers a live-reading during use. COMFORTABLE FIT–Smooth Interior and spring-hinge allows for adult and child size digits without pinching or squeezing fingers. COMPLETE, MONITORING SYSTEM – Includes convenient quick release lanyard, 2 AAA batteries and illustrated English/Spanish instructions for fast set up and use. Accurately measures oxygen saturation of arterial hemoglobin and pulse rate Accommodates a wide range of finger sizes approximately 20-75mm, user weight approximately 33 lbs ~ 242 lbs (15KG ~ 110KG) No prescription required | Latex-Free Low battery indicator / Automatic shut-off / Batteries included: 2 AAA Includes: oximeter unit, 2 AAA batteries, nylon lanyard, and detailed English/Spanish guidebook