The Bluetooth Serial Port Module OBS421 is a Bluetooth v4.0 modulewith UART interface for transparent serial data transmissions. Sincethe module is a dual-mode module the serial data can be sent both usingClassic Bluetooth technology via SPP and using Bluetooth low energytechnology via the connectBlue Low Energy Serial Port Service. With the Bluetooth stack embedded, you can be up and running quickly as there is no need for a driver or stack in your host. The module is fully Bluetooth qualified and radio type approved for Europe, Japan, US andCanada. It also has the connectBlue standard interface for compatibility over time and radio Technologies.