hardflip15

Need help setting up stand alone DVR Motion detection. Its a 160gb Stand alone DVR. I am going to set this up with two wireless and two wide andgle camera's. Now I need to know how to make it just record on motion. in the dvr's menu I can select under motion detection low, med high. But that doesnt make it record on motion. On the back of the dvr there are sensor and alarm inputs. Do I need motion detectors that go into the sensor spot or something? Thanks for your time!