This range finder will turn your ATN Smart Sight into a precise hunting machine. It's simple to set up. Just screw on the front of your Smart Sight, pair the bluetooth, and then Zero-in to fine tune the adjustment. It's compatible with ATN Smart HD Day, Night, and Thermal riflescopes. Scope not included. This item requires an ATN Smart Sight to work, it does not work as a stand alone range finder.