SRD
Blindsight 60 ft., Passive Perception 11
Echolocation. The bat can't use its blindsight while deafened.
Keen Hearing. The bat has advantage on Wisdom (Perception) checks that rely on hearing.
Bite. Melee Weapon Attack: 1d20 to hit, reach 5 ft., one creature. Hit: 1 piercing damage.