Features: Monitoring a person's blood oxygen level(SpO2), pulse rate(PR), and perfusion index (PI). Specifications: Scope of measurement: SpO2: 35% – 100% High brightness LED display: Sp02, PR & Pulse Bargraph Pulse rate: 25-250 bpm (beats per minute) ±2bpm Precision: SpO2: 70%-99%: ±2% Pulse rate: 25-250 ± 2 bpm Alert: When SpO2 <94%. When Pulse rate <50bpm or >130bpm Light & Compact Beep Alert, screen flashing Low Battery Indicator Automatic Power-Off Battery (2 “AAA” Alkaline batteries) provided 9 months warranty Dimensions: 62x37x32mm Weight(without batteries):40g Parameters: Pulse Rate,SpO2,Perfusion Index Indication: Low battery Application Range: Adult, Adolescent Package Contents 1 x Fingertip Pulse Oximeter 1 x Operation instruction 1 x Carrying case 1 x Lanyard 2 x AAA Batteries 1 x Retail box