The RN-42-SM is a small, surface mountable Bluetooth module marketed by Roving Networks, Inc. The module supports master-slave operating modes and is a self-contained Bluetooth 4.0 module. The RN-42-SM was designed as an advanced class-2 module, able to communicate with Bluetooth-enabled devices up to 30 feet away. It supports Serial Port Profile (SPP) for point-to-point communication, advanced audio streaming and Remote Control and configuration. The RN-42-SM module can be used for a variety of applications, including ROV (Remotely Operated Vehicle) for underwater exploration and surveillance.