functions Armbands Size: 22-32cm 99 memory groups for two people, IHB arrhythmia detection, WHO blood pressure classification Intelligent pressure, real-time voice Tension and battery detection Product specifications Product size: 115x96x59mm Storage temperature: -20 ~ 50 storage humidity: 15% ~ 90% Operating temperature: 10 ~ 40 work humidity: 40% ~ 85% Display mode: LCD digital display Measurement method: pulse scan method / oscillometric method measurement range : Hypertension / Hypotension: 20 mmHg ~ 280 mmhg pulse: (40 ~ 200) Beats / Minute Precision: 3 mmHg ( 0.4 kPa) pulse: 3% of playback voltage: 3 V Package information color box volume: 11.2 x 10.2 x 16.2 cm, Weight: about 370 grams each Package Contains 1 x Digital Automatic Upper Arm Blood Pressure Monitor 1 x Arm Cuff medium (22cm-32cm) 1 x User Manua