Files containing bat calls of the species Pipistrellus pipistrellus and Pipistrellus pygmaeus. The files are divided into three folders: Pipistrellus pipistrellus pure calls, Pipistrellus pygmaeus pure calls and silences. They are named following the following syntax: Specie_Day of recording_Time of recording_Index of full audio fragment_Starting sample_Power relation category_Call boolean_Index of 400ms fragment_B_ - Specie: Audio fragments of the species Pipistrellus pipistrellus are tagged as PIPI and audio fragments of Pipistrellus pygmaeus are tagged as PIPY. - Moment of recording: Day that the audio file was recorded. It follows the format YYYYMMDD. - Time of recording: Moment of the day when recorded. It is formatted as HHMMSS. - Index of full audio fragment: Reference to the position of the separation of the audio file into 400 ms chunks. - Starting sample: Reference to the position of the starting sample in the 400 ms division. - Power relation category: Category in which the file has been classified for the division of its pure call and silent parts. - Song boolean: Binary value that indicates the presence/absence of a bat call. It is labeled as a 0 if it is a silent fragment and as a 1 if a call is present. - Index of 400ms fragment: Relative position of all the files created from the 400ms initial fragment. In case of being a 400 ms silent fragment, the filename only contains the four initial parameters, from the species name to the index of the full audio fragment. These files are preceded with the characters S.