Sens. Jeff Flake, R-Ariz., and Chris Coons, D-Del., sent a letter earlier this week to Amazon Chief Executive Officer Jeff Bezos demanding answers on consumer privacy protection protocol.

The demands come in response to a recent incident where an Amazon Echo device recorded a family’s conversation, then sent it to a random person in their contacts. The controversy sparked backlash from consumers, citing eavesdropping and privacy concerns. The letter specifically asked for details about technical design elements and privacy features of the Echo device, popularly dubbed “Alexa.”