1. Locate the serial number of your NVR or DVR. The serial number can be found at the following locations: ▫ On the underside
BTTI Limited - Hikvision DS-7204HQHI-K1/P 4 Channel HDTVI DVR (1HDD UP TO 6TB) 1080P HD TVI & Analog Camera Hikvision DS-7204HQHI-K1/P Type - HDTVI DVR Number of Input Channel - 04 Channel
![Amazon.com : Hikvision H.265+ Turbo HD 16CH DVR 4K HDMI Supports up to 8MP TVI/5MP AHD/4MP CVI/ Plus 16CH of 8MP IP CAM (HDD not Included) : Electronics Amazon.com : Hikvision H.265+ Turbo HD 16CH DVR 4K HDMI Supports up to 8MP TVI/5MP AHD/4MP CVI/ Plus 16CH of 8MP IP CAM (HDD not Included) : Electronics](https://m.media-amazon.com/images/I/610j1P4Ex8L.jpg)