Dual purpose entrance attachment has two purposes:
Moving: attached to the front of the hive, close all entrances after sundown to keep your bees contained and prepare for relocating your hive. (Make sure your hive is all strapped together or stapled together.)
Robbing: three entrances for controlling the entrance to prevent or correct robbing by other bees and yellow jackets while allowing ample airflow. To prevent or help with robbing, close the bottom two entrances and leave the top entrance open: the blocked portion will prohibit robber bees and yellow jackets from seeing where resident bees are coming and going from.
Installation: Using wood screws (not included) long enough to go through the robbing screen and into your bottom box, screw each side of the screen into the face of your bottom box.