Features: Display Parameters: blood-oxygen SPO2 value, pulse value, pulse waveform chart. Clear L-ED Display Screen: Adopted clear precise L-EDcolorful screen display. Display Mode: Up and down directions meet your different need. Energy Saving Eco-friendly: low pow-er consumption, and it is powered by 2 * AAA b-atteries can last for long working hours(B-atteries are not included). Automatic Shutdown: when no signal is generated, the product will automatically shut down after 8 seconds. User-friendly: Integrated with blood-oxygen probe and processing display module, the product is simple to use, low pow-er consumption, small size, light weight and easy to carry.