Pulse measurement range: 40 beats/min~199 beats/min Blood pressure measurement error: ±3mmHg (±0.4kPa) Applicable arm circumference: 22cm~36cm Pulse measurement error: ≤ reading ±5% Battery: high-energy long-lasting battery Scope of application: for measuring human blood pressure and pulse (adults over 12 years old, not suitable for newborns)