Purchased these to install security cameras on the farm and prior to installing them checked them out in my office and found the cellular service out here was not good enough to keep them connected to the network. These are “cellular” based self powered (PV panels) cameras i.e. each one needs its’ own sim card. Top of the line cameras day, night, automatic notices when activated and can see the camera views on your phone or computer. Ideal for locations where there is no power or Wi-Fi coverage. Tried returning to PB Tech and as it was past 30 days since purchase would not give a refund or credit so offering up on Trade Me.