DS-7608-NI . 4 camera system. Bought in 2017 off Amazon . Not happy with inability to look for an event. Cannot upgrade the software either. My options are : a) buy the
HyperX 16GB (Kit of 2) 1866MHz DDR3L CL11 1.35V SODIMM HyperX Impact Laptop Memory HX318LS11IBK2/16 at Amazon.com