1. Small & lightweight design 2. True color OLED display 3. 4 display modes 4. Display Spo2,PR,PI,Pulse Bar,Plethysmogram 5. Low power consumption,automatically power off 6. Low-voltage indicator 7. 2AAA alkaline batteries 8. Accommodates widest range of finger sizes from pediatric to adult 9. Audible & Visual alarms. 10. Standard Accessory 11. Operating manual 12. Hang string