The included sensors can be used on doors or windows.
Brad's Deals Editor Michael,
This Zmodo Pivot 1080p Rotating Security Camera and Door Sensor bundle drops from $99 to $79.95 at QVC. Shipping will add $5.50, but this is still the best price we found for this set by $15. The camera can be accessed and controlled over WiFi using a smartphone app. It has two-way audio, a 360-degree motion sensor, and will automatically rotate to view the included door sensors when they are triggered. Sales tax is charged in most states.