Display Mode : LED Color Screen Display Blood Oxygen Measurement Range 0-100 % (Resolutions of 1%) Accuracy of Pulse Measurement  +/-2bpm or +/-2% Taking the maximum Pulse Measurement range : 30-250bpm (Resolution of 1bpm) Accuracy of Oximetry : 70-100%, +/-2% Less than 70% undefined Supply Voltage : 3.0DC (2AAA Alkaline Batteries) Product Weight : 70GM Product Dimensions : 32*33*60mm