How to connect this optical fingerprint sensor to Arduino UNO

Hello, guys

About 2 months ago I purchased this "Fingerprint Recognition Module for Arduino Optical Fingerprint Sensor" from

It arrived yesterday and imagine my surprise when the module actually had 7 pins instead of 6, and was way smaller than they should be (the space between two pins is like 0.8 - 1 mm). Here is what it looks like (I am sorry in advance for the bad quality of the pictures):

So how do I connect it to Arduino UNO?

Did you found a solution?