Shelly BLU Gateway is a small USB dongle acting as the gateway between Shelly BLU devices and the Shelly Cloud. If you want to use Shelly Gen-1 devices with Shelly BLU sensors, Shelly BLU Gateway can serve as a gateway to Shelly Cloud and thus to your existing Gen-1 devices. This way, you can eliminate the need for an upgrade to Shelly Plus or Pro devices. But Shelly BLU Gateway isn't just limited to cloud connections! The device allows for local control with immediate response through scripting.