This indoor proximity card reader works great and has a LED to indicate positive card read, and a buzzer. Great for interior doors and areas where access must be monitored or controlled. The sleek design is unobtrusive and fits into any decor. Its small, so it can be placed in locations that make it unseen from the street or by people who don't know its there. It has a simple appearance yet performs with a visual and audible feedback that users appreciate. Use a controller like the ECL-ACC1000 or similar for anti-passback, multi-door operation and more.