The only thing you can do is read the safety information on the product. Some key points might be listed in the product summary.
Read about how the product closes, and whether or not it has extra protection for fingers or anti-slip mechanisms. It's also extremely important to read the directions before use.
A lot of ladder injuries occur because of failure to properly follow the directions. If there is a manual, read it first and if the instructions are very specific you should follow them in the complete order to avoid injury.