Reads SpO2 and Pulse Rate. Accuracy: SpO2 ±3% / HR ±2 BPM. Six changeable display modes. 10 display brightness settings. Child-friendly instrument face. Fits fingers with a thickness of 0.2" to 0.63" (5.0mm to 16.0mm). Carry lanyard. Soft carry case. Two "AAA" batteries. Instruction booklet. Two year limited warranty.