US Patent 11019475 Mobile device attachment with user activated alarm

The subject matter of this specification can be embodied in, among other things, a mobile device accessory that includes a first housing defining a first attachment surface that is configured to adhere to another surface, a user input mechanism configured to activate in response to input by a user of the mobile device, and circuitry configured to activate in response to activation of the user input mechanism, wherein activation of the circuitry (i) causes an audible alarm to be emitted by the mobile device, or (ii) causes a software application to be executed on a mobile device, or (iii) both.