The Siemens 192-850W T-STAT Retro Kit is a white, compact T-STAT unit that is designed to retrofit older buildings with energy management capabilities. The 192-850W features a touchscreen display and a variety of sensors to measure energy use, temperature, and humidity. The unit can be connected to a computer to display data in real time, and it can be configured to send alerts when energy use or temperature reaches predetermined thresholds. The Siemens 192-850W T-STAT Retro Kit is a cost-effective way to improve energy efficiency in older buildings.