@reolink-fiona hello and thanks for this update.. I jist purchased the nvr and 3 823a cameras and plan to buy more.. one of the issues is that when yiu get closer to the camera you can literally iut walk the camera rendering the pan tilt useless. If you walk and tiptoe in front the camera it will follow you pan and tilt bit normal walking speed of aprox 2.5 mph.. to 3mph it stop tracking you and sits in the position it lost you in and then goes back to it's starting position. Could we sup the speed on the camera and maybe force it to track based on the moving image and keeping that image in the middle of the screen at all times making it harder to lose a person walking by? I can provide test videos and do testing if needed.