HERS MEDICAL YS-851 Fully Auto-Upper Arm Blood Pressure Monitor Features: 1. Power:4 aa size alkaline batteries 2.60 groups memory function, 3. Automatically inflate and deflate, automatic power -off function. 4. Measurement range: Pressure: 0mmhg -299mmhg pulse 40-200 time/min 5. Measurement accuracy pressure + -mmhg Pulse + - 5 percent of reading Packaging gift box size 170 x 66 x 220mm 20pcs/ctn