[Home](./index.md) > [@digitalpersona/devices](./devices.md) > [CardsReader](./devices.cardsreader.md) > [onDeviceConnected](./devices.cardsreader.ondeviceconnected.md) ## CardsReader.onDeviceConnected property An event handler for the [DeviceConnected](./devices.deviceconnected.md) event. This is a unicast subscription, i.e. only one handler can be registered at once. Signature: ```typescript onDeviceConnected: Handler; ```