Several children die every year in the UK due to cords and chains on Blinds.
You can fix safety devices such as cleats or a chain tensioner to improve safety but the best option is to avoid the situation all together.
Wand operated Vertical blinds have no dangerous chains or cords and are operated be moving the wand to the side which is a much safer option.
All of our Vertical blinds also come with chainless vertical weights that again remove the chains from the bottom of the blind where they are venerable.