What's the difference between the two please?
https://www.exactcctv.com/collections/cctv-nvr/products/hikvision-ds-7604ni-e1-4p-nvr-uk-model
http://www.netviewcctv.co.uk/4-channel-hikvision-nvr-poe-25mbps-ds-7604ni-e1-4p-bb.html
https://www.exactcctv.com/collections/cctv-nvr/products/hikvision-ds-7604ni-e1-4p-nvr-uk-model
http://www.netviewcctv.co.uk/4-channel-hikvision-nvr-poe-25mbps-ds-7604ni-e1-4p-bb.html