Passive Infrared (PIR) sensors have been used in thermostats for years; often with bulkier designs compared to modern millimeter wave (mmWave) radars. PIR sensors typically require a wider field-of-view lens and detection unit, resulting in larger overall dimensions. This design can appear less streamlined or sleek compared to the compact mmWave radar. In contrast, mmWave radar technology is built around miniaturized components and advanced algorithms that enable precise temperature sensing without the need for bulky lenses or detectors. When considering installation, this slimmed-down profile of mmWave radar modules allows for greater design flexibility, enabling seamless integration with various home decor styles or architectural features.

To highlight the visual appeal difference between these technologies:

PIR sensor: Typical size range around 4-6 cm³; distinct lens and detector components visible from an external perspective. mmWave radar: Approximately 1-2 cm³ in volume; compact, inconspicuous design with negligible visual impact on surroundings.

By embracing a more refined and compact user interface design combined with the tiny mmWave radar component, there is a complete makeover in both function and style of smart thermostats. This new approach to product development encourages thinking about how digital products interact, coexist, and become integral parts of lives of the users.