The lens is located in the middle, it is hard to see unless really up close. 
<br />It is not completely invisible, but well hidden.
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<br />Photo: 4032 x 3024    ---   5 Mega Pixels
<br />Memory: support up to 32GB TF Card, 
<br />Video Resolution: 1920 * 1080P AVI
<br />Voice/Audio Recording via Internal Microphone
<br />Video Framerate: 30FPS                       
<br />Battery Life: 90 Minutes of Recording (Internal)
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<br />These hidden spy glasses record audio and video at the same time, in 1080p. 
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<br />Easy operation. Insert Card, Turn on, Push Button to record/stop recording.
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<br />To recover videos, hook up to pc, or remove micro SD card and insert into your device for viewing. 
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<br />Package included:
<br />1X  Video Camera Glasses
<br />1X  USB/Charging Cable
<br />1X  User Manual
<br />Note:memory cards not included.