Two-color display with brightness adjustable, SpO2 / PR and perfusion index value display, 70~99% measuring range, ±1% blood oxygen saturation, 30bpm ~ 250bpm pulse measurement range, ±2bpm or ±2% accuracy, ambient light interference, 30mAh power consumption, 3.0V DC working voltage, 1.5V 2 x AAA alkaline battery with one safety bags accessories, 58 x 30 x 30mm product size, 50g weight with battery.