Model:CMS50QA - Color:Pink - Material:Plastic - Quantity:1 - Display Screen:LCD - Functions: Can be used in measuring the pulse oxygen saturation and pulse rate through finger. - Features: Small appearancemore fit for children; Automatically power off function; Low-voltage indication; A pulse rate sound indication SpO2 Measuring Range0%100% (the resolution is 1%). Accuracy70%100%!?2% Below 70% unspecified. PR Measuring Range30bpm250bpm (the resolution is 1bpm) Accuracy!?2bpm or !?2% (select larger) Measurement Performance in Weak Filling Condition:SpO2 and pulse rate can be shown correctly when pulse-filling ratio is 0.4%. SpO2 error is !?4% pulse rate error is !?2 bpm or !?2% (select larger). Resistance to surrounding light: The deviation between the value measured in the condition of man-made light or indoor natural light and that of darkroom is less than !?1%. - Power Consumptionless than 50mA - Voltage:DC 3.6V~4.2V - Power Supply: 1 x LIR2450 battery (not included) - Battery working hour:10 hours