One set packed into one carton(0.054cbm) for central motor
1.With high performance Ni-Cd cell available,supplying rekiable standby electric power to ensure the system continually working under power outage situation. 2.Using microcomputer to control the up and down moving,with the characteristic of correctly locationing and easy for adjusting. 3.Rebounding Functional when it is blocked:when the door was blocked beside is gate spacing during it's closing down,the door moving will stop automatically and turn to opening.And blocking force can be adjusted according. 4.Stopping functional when it is blocked:when the door was blocked beside its gate spacing during it's opening(rising up),the door moving will stop automatically.