Brandt's Bat is a species of vesper bat

Vesper bat

Vesper bats , also known as Evening bats or Common bats, are the largest and best-known family of bats. They belong to the suborder Microchiroptera . There are over three hundred species distributed all over the world, on every continent except Antarctica...

 in the Vespertilionidae family.
It is found throughout most of Europe and parts of Asia.

It is named for the German zoologist Johann Friedrich von Brandt

Johann Friedrich von Brandt

Johann Friedrich von Brandt was a German naturalist.Brandt was born in Jüterbog and educated at a gymnasium in Wittenberg and the University of Berlin. In 1831 he was appointed director of the Zoological Department at the St Petersburg Academy of Sciences, where he published in Russian...

.

Echolocation

The frequencies used by this bat species for echolocation lie between 32 and 103 kHz, have maximum energy density at 51 kHz and have an average duration of 4.2 ms.