Keep in mind that the 841 is in the line of the 1051. These have been replaced with a v3 model that isn't same quality of camera. PCB is 1/2 the size and they removed Alarm and Audio in and out for external access. However this isn't what makes this v3 line not as good in my mind. That is they removed the Zoom feature in the V3 and added a Tracking mode. Tracking mode works but not well in my case.. So I don't use it.. The v3 of the 1051 is now the 1041 because well I guess they wanted to keep with 8, 9 and 10 in same line as not to confuse others... 1041 has some issues that others have reported and most times related to wifi or some connection issues not sure right now as I have not seen a post as of late about it.. But there have been a good few since the v3 release the 2mp and 3mp aka 8 and 941 are solid again besides missing the zoom and I do use that on my older v2 and 1 841, 941 and 1051.. Zoom is not Optical but works well enough if you use that feature and like to use in presets then I would source some NOS on Ebay as I can find them there a lot still new in box.. NOS=New Old Stock in case wondering..