People like that the 8 hardwired zones are built into the panel instead of having to add a device to add hardwired zones. The IQ Panel 4 does have a built in Camera for disarming pictures, alarm recording, and peek in pictures.
The IQ PowerG remote communicates via wireless communication but can be powered using existing wires to allow installation where current keypads exist as long as they aren’t long runs.
They monitor an area. It depends if its wall mounted or ceiling mounted and the angle as well. Here is the installation manual for the PG9922 Glass break sensor with more information on mounting
As for wireless sensors, I recommend PowerG devices. You can read about PowerG wireless Communication here.
The PowerG wireless window/door sensor and the IQ Mini window/door sensor are practically the same but communicate using different frequency.
The IQ Mini extended also has one input for an external hardwired sensor switch
The PG9935 PowerG Shock Sensor comes with both the reed sensor for both open/close and shock notifications with the panel.
If you use any of the IQ Mini sensors, you will need the 319.5 Radio version of the panel.