The Battery Powered Infra-Red Transmitter by TriggerSmart is an optional accessory to the TriggerSmart Camera Triggering System. The cabled IR transmitter is included in the TriggerSmart Kit, but there might be times when it is inconvenient or impossible to set up the infra-red receiver and transmitter with the cable attached. In these cases, the battery powered transmitter is a better option. It works the same as the UK11 IR Transmitter and Sound Sensor by sending an infra-red beam that, when broken, triggers the camera to shoot.