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