About product and suppliers:
            951 ttl yongnuo products are offered for sale by suppliers on Alibaba.com, of which camera flash light accounts for 77%, other camera accessories accounts for 10%, and photo studio accessories accounts for 1%. 

A wide variety of ttl yongnuo options are available to you, 

There are 952 suppliers who sells ttl yongnuo on Alibaba.com, mainly located in Asia. The top countries of supplier is China, from which the percentage of ttl yongnuo supply is 100% respectively.