Weight Range: >66 lbs. (>30 kg) For measurement of blood oxygen saturation and heart rate. Contents: Reusable adult SpO2 sensor, protective sleeve, 3 AA batteries, software CD, USB cable, screw key, user’s manual, hanging strap Large 2/8" TFT display screen. Adjustable backlit brightness. Dual working modes; continuous or spot check. Replay data in time. Large storage capacity - 127 patient ID’s and 72 hours record storage. 3 alkaline batteries (rechargeable). Adjustable audio and visual alarms; battery low indicator. Two-Year Warranty Not Made With Natural Rubber Latex.