# Add BLE and USB support for Flex and Stax

## DMK

### Prerequisites

Device Management Kit: v0.4.0 (and later)

### Implementation

```typescript
import { DeviceManagementKitBuilder } from "@ledgerhq/device-management-kit";
import { webBleTransportFactory } from "@ledgerhq/device-transport-kit-web-ble";
import { webHidTransportFactory } from "@ledgerhq/device-transport-kit-web-hid";

const dmk = new DeviceManagementKitBuilder()
  .addTransport(webBleTransportFactory)
  .addTransport(webHidTransportFactory)
  .build();
```

Find more information [here](../integration/how_to/transports).

## LedgerJS

### Prerequisites

LedgerJS transport libraries: v8.3.0 (and later)

### Implementation

```typescript
import TransportBLE from "@ledgerhq/hw-transport-web-ble";
import TransportUSB from "@ledgerhq/hw-transport-web-usb";

// Example of connecting to a device via BLE
const transportBLE = await TransportBLE.create();
const ethAppBLE = new AppEth(transportBLE);

// Example of connecting to a device via USB
const transportUSB = await TransportUSB.create();
const ethAppUSB = new AppEth(transportUSB);
```

Find more information [here](../ledgerjs/info).

## Custom Integration

Use the identifiers for devices and transport [as describred in the reference section](../references/identifiers).