Effectively deterring theft is no longer expensive or time consuming with Q-SEE’s sign and door alarm combo. This package offers the essentials you need to help dissuade intruders. A sturdy Warning Surveillance in Progress sign adds realism and gives would-be intruders a clear warning. The 4 included alarms help protect windows and doors. These alarms are easy to install, adhesive pads included and buzz loudly when the 2-pieces separate. The included alarms are white and discrete, allowing them to blend into most home interiors. Each alarm also includes batteries and operates as a standalone so you can get started protecting what matters most right out of the box.