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