A bat attractant is usually a spray of some sort that mimics bat pheromones or guano (bat poo). The idea being that the bats will be able to smell the familiar scents from quite a distance and come checkout the bat box. Upon inspection, they'll realize what a perfect home your bat box would make and take up roost.

Does bat house attractant work?

Existing evidence strongly suggests that lures or attractants (including bat guano) will NOT attract bats to a bat house. ... Bat houses installed on buildings or poles are easier for bats to locate, have greater occupancy rates and are occupied two and a half times faster than those mounted on trees.

How do you use BAT attractant?

Bat Call Bat Attractant Paste

Spread a thin layer of paste evenly along the landing pad of the bat box. Just make sure to wear gloves and protective gear.