A voice controlled assistant having a housing to hold one or more microphones, one or more speakers, and various computing components. The voice controlled assistant facilitates transactions and other functions primarily through verbal interactions with a user. In some situations, a transaction may require entry of a code, which the user may wish to enter in a non-verbal way. The voice controlled assistant is configured to analyze an audio signal to detect user interactions with the surface of the voice controlled assistant and to interpret the detected interactions as entry of the code.