What is DeviceKeystring?

I bought a used Galaxy S4 from Amazon for my wife. I was setting it up and closing out open apps and noticed one called "DeviceKeystring". I have an S4 and have never seen anything like that before. There's nothing in the app drawer or app manager.

It's kinda sketchy looking. It has a numbered list to activate Camera, VT camera, vibration, speaker, etc. An equally sketchy sounding song plays if you select "Melody" or "Speaker"

Just wondering what this is. I couldn't find anything. Basically just making sure someone isn't logging everything she does with the phone or something...

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