Why would you ever need a hidden spy pen camera? Well, there are a lot of reasons. It is up to you what those reasons are, but there are some common uses for having a spy camera so little and close by constantly. What’s amazing about these small hidden cameras is the fact that the camera is so extraordinarily small that no one would ever guess that there is a camera inside. It has a little DVR inside that takes care of the recording. You can then transfer the recordings to your PC later so you can see the recordings. EBazar.Ninja offering Hidden Spy Pen Camera with an inbuilt memory of 4 GB.