1. OLED screen: high-definition screen, clear reading; 4 directions and 6 display modes 2. Portable: lightweight, easy to carry around 3. Multiple functions: simultaneous measure the SpO2, pulse rate and perfusion index 4. Energy saving: Without use, auto-power off in 15 seconds 5. Optional bluetooth: real-time data transmission to APP 6. After many clinical verifications, AOJ Medical has mastered the optoelectronic technology