Mechanical DI Model: GL Water Transform your standard meter into a smart meter! We combine the pulse converter and telemetry in a single product, customized and with Plug&Play fitting. The GL Water Mechanical DI is a Bluetooth Low Energy (BLE) device that enables the use of patented Group Link™ technology. It uses a 2.4 GHz transmission frequency, compatible with the vast majority of smartphones already manufactured. For models of the Diehl brand and model / Pre-equipped Mechanical, it has a range of 500 meters. Protection Degree: IP68.