While many systems use wireless components that are installed using double sided tape, some high end systems use components that require professional installation. These soup to nuts systems typically cost considerably more than DIY systems and offer 24/7 professional monitoring, but you may have to enter into a multi year contract and pay a hefty termination fee if you break it. They usually use touch screen hubs thatcontain RF, Wi Fi, Zigbee, and Z Wave radios, allowing them to communicate with and control a multitude of components including door and window sensors, door locks, glass break detectors, indoor and outdoor cameras, light switches, motion and water detectors, smoke/CO alarms, thermostats, video doorbells, and a host of other home automation devices. With a professionally monitored system, when a smoke or intrusion alarm is triggered, an agent will first try to reach you via the two way control panel before calling your listed phone number. If you fail to respond, the agent will call 911 to dispatch an emergency responder to your home. The nice thing about professionally installed systems is you don't have to lift a finger; after you've placed your order a technician will come to your home, set everything up for you, and show you how the system works.