Constrution Features:
1,The whole system without chain or cord control ,It's really safe.
2.Lower pull rope or lower beam 2-3cm,and the system will unlock automatically ,fabric rises at a constant speed under elastic force ,Pull down the rope or lower beam > 3cm ,Fabric stop automatically after release.
3.Roller blinds can be stopped at any height .
4.By adjusting the number of pre tightening turns of boost spring,the rising speed of roller blinds can be adjusted 

Performance Features:
1.Min width:0.9mm
2.Max Height 3m
3,Max load 6kg