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