3 colors backlight for lcd 1. Large lcd size :80 x 72mm; 2. 2x90 groups memory function; 3. Average calculating for the latest 3 times measurement value; 4. Blood pressure classification (who) indicator; 5. Irregular heartbeat (ihb) indicator; 6. Year/month/date/time function; 7. Accuracy :pressure 8. Automatically inflate and deflate; 9. Power by 4 aa size alkaline batteries or ac/dc power supply; 10. Automatic power-off function Packing details: 1 pc /gift box 1. Product size: 140x113x65mm 2. Gift box size: 155x80x185mm 3. Meas: 422x332x392mm, 20pcs /ctn 4. N.W/g.W.: 10.1/10.8kgs 5. 20': 10, 000 pcs / 500ctns 6. 40': 20, 000pcs / 1, 000ctns