1.Suitable for roller blind,bus shade,boat shande
2.mechanical limit switch ti set the up and down limit switch,series CH28-1230B use mechanical limit switch,you can use hand to set the up and down limit switch,B  means special limit for cassette blind.CHR28-1230 use mechanical limit switch but receiver bulit-in,CHR28-1230B use mechanical limit switch but receiver bulit-in,you can use hand to set the up and down limit switch.CHE28-1230 usethe romote to set the limit switch
3.Low voltage motor with either12v or 24v
4.We could offer the suitable aulminum tube for your system
5.For the special application,we can make the special design for you