They have been selling on the Amazon.com marketplace since 2017. They sell in Electronics, Tools & Home Improvement and Health & Household departments from General brand. They have several dozen products in stock fulfilled from their own warehouse in China.
Yoo.ing business name, phone number, address and email might be available by contacting Yoo.ing. For customer service, returns, refunds and other issues contact Amazon.com. They also sell in the Canada marketplace.