1.Inner handhold designed for portability and Light Weight. 2.High resolution thermal printing array system. 3.High frequency response reach to 150Hz. 4.Capable of printing continuous one channel trace and annotations including lead mark and such parameters as sensitivity, paper speed,and filter operation status. 5.High resolution digital filter inhibits baseline. 6.One-touch operation able to enhance efficiency and relieve operating strain. 7.Concept of floating input circuit meets IEC safety standard. 8.Visual status due to light indicated touch-keys. 9.Rechargeable battery supporting more than 50 patient examinations. 10.Under the automatic mode, pressing key MODE continuously can keep 11.The wave-form is displaying synchronously on the LCD with 240x128 dots.