Shelly BLU Door/Window sensor

The Shelly BLU Door/Window sensor is a high-tech smart home device developed by the Bulgarian company Shelly Group AD. Shelly has established itself as a disruptor in the IoT market by providing open-source friendly, affordable, and versatile automation tools for consumers worldwide. While the brand was originally founded and is currently headquartered in Bulgaria, the hardware manufacturing is primarily outsourced to specialized production facilities in China to ensure scalability and global competitiveness.

The brand's ultimate owner, Shelly Group AD (formerly known as Allterco Robotics), remains based in Sofia, Bulgaria. The company has seen significant international growth, leading to various regional subsidiaries that handle distribution and support, particularly in Europe and North America. This particular product leverages Bluetooth technology to monitor the status of home entry points, integrating seamlessly into modern smart home ecosystems.