★2 Color OLED display ★It has four directions with six different display modes; ★Low power indicator； ★The Blood Oxygen,The Pulse,The bar chart,The pulse waveform Display； ★The menu is easy to set up； ★In the absence of signals for 8 seconds, the product will be power-off automatically; ★Small and light weight, convenient to carry； ★Grey,Green,Purple,Blue,Pink 5 Colors can be choose. Specification: SpO2:Measurement range:70%～99% Accuracy:±3% on the stage of 70%～99% Resolution:±1% PR:Measurement range:30BPM～240 BPM Accuracy:±2BPM Power Supply: two AAA 1.5V alkaline batteries Power Consumption:below 30mAh Automatically Power-off: The product automatically shuts off when no signal can be detected within 8 seconds Dimension:Approx. 58mm×35mm×30mm Operation Environment: Operation Temperature:5℃～40℃ Storage Temperature:-10℃～40℃ Operation Humidity:15%～80% Storage Humidity: 10%～80% Air Pressure: 70kPa～106kPa