The calendar is not appearing on the screen when I hit Search and Playback, which is where I think you set the time and date? Help, anyone? Thank you!
I've checked and it appears there is a manual for this device. The manual is in PDF file format and contains everything related to the Blackbox NS840 and its configuration procedure. I recommend you access the link below to visit the Google and then access the PDF file. The file you need is on the 2nd link posted. Click it and the option to save the PDF file will appear.
