Hi @suriya26091994, welcome to Anker Community.
Thank you @TechnicallyWell for the answer. There is no need to register the majority of Anker products for warranty purposes.These products that purchase from AnkerDirect have a-18 Month Hassle Free Warranty.
However, powerline II cables, screen protector and some cases come with lifetime warranty. So for powerline II cables, please register warranty on https://www.anker.com/lifetime. As for other products, there is no need to register warranty online.
Thank you again for your time. Have a great day!