connectBlue's Bluetooth serial port module OBS421 is a Bluetooth 4.0 V module with UART interface for transparent serial data transmissions. Since the module is dual-mode, the serial data can be sent both using classic Bluetooth technology via SPP and using Bluetooth low energy technology 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, Canada, and the US. It also has the connectBlue standard interface for compatibility over time and radio technologies.