If you are looking to do a little surveillance and need a sneaky way of looking through brick, block, wooden, or concrete walls, then the Prism 2ooc backpack radar might come in as a handy addition to your equipment.
The portable Prism 200c radar device has been developed by Cambridge Consultants for use by law enforcement and the military departments and developed for high-risk and hostile situations with minimal time and very narrow margin for error.
The operator of the Prism 200c can simply lean against a wall to either monitor or record the activity within a building, maintaining cover by operating it via a handheld laptop computer or similar personal device on site.
Its also fitted with a battery capable of providing upto 8 hours of battery life, and being able to fit in a backpack makes it ideal for covert operations.
Source : Fast Company