McKesson Handheld Pulse Oximeter, Pediatric is weight Range 22-110 lbs. (10-50 kg). This is for measurement of oxygen saturation and heart rate. Contents are Reusable pediatric SpO2 sensor, 3 AA batteries, software CD, USB cable, users manual, hanging strap.This is large 2/8 TFT display screen. Adjustable backlit brightness. Dual working modes; continuous or spot check. Replay data in time. Silicon rubber boot. Large storage capacity - 127 patient IDs and 72 hours record storage. 3 alkaline batteries. Adjustable audio and visual alarms; battery low indicator. Two-Year Warranty.