This model of the Assisi Loop Lounge has been designed for use with certain Sleepypod pet carriers.  Should you use this Assisi Loop Lounge as a stand-alone device, or in a different pet bed or carrier, these should contain no metal components (e.g.  door, frame, or floor) that could disrupt the patented Assisi signal and diminish product efficacy. If in doubt, please call Assisi Animal Health Customer Service.