Embodiments of an environmental monitoring system that mitigates complexities in installation and maintenance while complying with strict regulations on operations of the system. The environmental monitoring system may communicate wirelessly between components such as sensor units and display devices, enabling these components to be separately and easily installed in an environment without needing to install wires in the environment to connect them. In addition, in embodiments at least some of the components (e.g., sensor units and display devices) of the environmental monitoring system may be adapted to wirelessly and reliably communicate using specific wireless communication protocols, described in detail herein, that exchange few communications between the components and thereby decrease power consumption of these components. Further, in some embodiments, a display device may include hardware and/or execute software that drive and/or update a display only when a condition is met.