> ## Documentation Index
> Fetch the complete documentation index at: https://docs.efference.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Connect to a Device

> Open an M1 and read its identity over USB or Bluetooth LE

Open the M1 and print its serial, model, and firmware version.

<Tabs>
  <Tab title="Wired">
    USB is the default connection.

    ```cpp theme={null}
    #include <iostream>
    #include <ef/Device.hpp>

    int main() {
        ef::Device device;
        ef::ERROR_CODE status = device.open();
        if (status != ef::ERROR_CODE::SUCCESS) {
            std::cerr << ef::to_string(status) << "\n";
            return 1;
        }

        ef::DeviceInformation info = device.get_device_information();
        std::cout << "Serial: " << info.serial << "\n"
                  << "Model: " << ef::to_string(info.model) << "\n"
                  << "Firmware: " << info.firmware_version << "\n";

        device.close();
        return 0;
    }
    ```
  </Tab>

  <Tab title="Wireless">
    Use the M1's BLE address. This opens a control-only session.

    ```cpp theme={null}
    #include <iostream>
    #include <ef/Device.hpp>

    int main() {
        ef::InitParameters init;
        init.input_type = ef::INPUT_TYPE::STREAM;
        init.ble_address = "AA:BB:CC:DD:EE:FF";
        init.ble_password = "123456";

        ef::Device device;
        ef::ERROR_CODE status = device.open(init);
        if (status != ef::ERROR_CODE::SUCCESS) {
            std::cerr << ef::to_string(status) << "\n";
            return 1;
        }

        ef::DeviceInformation info = device.get_device_information();
        std::cout << "Serial: " << info.serial << "\n"
                  << "Model: " << ef::to_string(info.model) << "\n"
                  << "Firmware: " << info.firmware_version << "\n";

        device.close();
        return 0;
    }
    ```
  </Tab>
</Tabs>