Bat Cone

Simple Bat Cone device that you put over the entry point they are using to your house, block off other entry points and it lets them out but not back in.

3 Designs
Bat cone (Simple square base with 3 screw holes
Bat Cone- Extra Mounts (Same as above but 4 extra fixing points for weird spots
Bat Cone-Right Angle entry (Fix fixing against weather board entrys such as when the weatherboard is over brick but warped open)

Only the last one above needs supports

Be great if you post your makes and comment the effectiveness. Similar entry and exit hole dimentioned to other products.