You have to manually wind and unwind the excess cord each time you need to raise or lower the blinds but they are a time tested simple design used to tie down boats with little opportunity for error.
Blind cord management.
Curtain hides the cord.
Aloola blind cord management blind cord retractor for child safety pack of two 3 6 out of 5 stars 8.
Keeps the cords high and safely away from kids.
Only 12 left in stock order soon.
Wrap the cord around two command hooks.
Free shipping by amazon.
You can do this with your hands and fingers.
You can get clear plastic blind cord wraps at any baby proofing source such as this one or hardware store try these.
Remove the cap covering the hole in the bottom rail of the venetian blinds.
Pull the cord toward you and cut the knot off the end of the cord.