What is the oval thing that looks like a front facing camera on the ZTE Savvy?

I have the ZTE Savvy and there is, what looks like a front facing camera, next to the notification light. What is it?

It's the proximity sensor. A sensor able to detect the presence of nearby objects without any physical contact. Commonly used on smartphones to detect (and skip) accidental touchscreen taps when held to the ear during a call.

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