An electric-eye self-registering attachment refers to a device that can independently detect and record events or movements. However, there are several synonyms for this term that are commonly used. One of the most popular synonyms for this term is an automatic recording device. This type of device is designed to automatically record any activity that falls within its range. Other synonyms for electric-eye self-registering attachment include optical sensor, motion detector, and automatic camera. All these terms refer to devices that can detect and record movements and activities without any human intervention. These devices are commonly used for security and surveillance purposes, as well as for research and development applications.