Simply open the device, the mobile's Bluetooth, the camera, and it simply starts tracking... no pairing, no application that asks for 10 different things to work, just one and done. For some reason, the tracking is more reliable and immediate in a horizontal position... but the lighting in the room also plays a role... it's the best for this job... durability will show over time!!!
P.S. the slight up and down movement is also mechanical, not manual...!!!!!!