I bought it because of Acusense in order to utilize 2 older Hikvision cameras. Acusense does its job on these cameras, albeit with limited capabilities compared to modern Acusense cameras, providing the ability for region detection, line crossing detection, etc.
During use, I noticed a problem with the pre-record time in continuous or scheduled recording. The event playback mode does not work properly and regardless of the set pre-record time, the event playback starts 3 to 5 seconds later, resulting in the target being missed many times.
I decided to upgrade the firmware and to my surprise, there was no new firmware on the European page, only on the global page of Hikvision, despite the device being intended for Europe. There was no firmware on the Netherlands and UK ftp, only a reference to incorrect firmware K51 in excel format.
Despite the upgrade to 4.73.006, the problem with the pre-record time was not resolved. The completely illogical thing is that if the recording is not continuous, but only event recording, the pre-record and post-record times work properly