Amazon barreled into the children’s smart-speaker market last year with a brightly colored device called Echo Dot Kids Edition. The tech giant played up the device as a simple way for youngsters to converse with Alexa, the company’s voice-activated virtual assistant, and obtain age-appropriate apps.

But recent research commissioned by two prominent advocacy groups found that the device also enabled children to easily divulge their names, home addresses, Social Security numbers and other intimate information to Alexa. In addition, the researchers reported that Amazon made it cumbersome for parents to delete their child’s personal details from the system.

On Thursday, the two groups — the Campaign for a Commercial-Free Childhood and the Center for Digital Democracy — joined more than a dozen others in lodging a complaint with the Federal Trade Commission. The groups say that Amazon’s practices violated the Children’s Online Privacy Protection Act, a federal law protecting the personal information of people under 13.