You have disadvantage on attack rolls and Wisdom (Perception) checks that rely on sight when you, the target of your attack, or whatever you are trying to perceive is in direct sunlight.

Your bat-like hearing makes you aware of your environment, you gain blindsight up to 10ft unless deafened, and you have advantage on perception (WIS) checks relying on hearing. You also have Darkvision out to a distance of 60ft. 

Your Dexterity score increases by 2, and your Intelligence score increases by 1.

Young batfolk grow quickly. They attain the size and development of a 10-year-old human child by the age of 3, and reach adulthood by 15. They live to be around 80.

Batfolk tend toward chaotic alignments, as they let impulse and fancy guide their decisions. They are rarely evil, with most of them driven by curiosity rather than greed or other dark impulses.

Batfolk are between 3 and 4 feet tall and average about 40 pounds. Your size is Small.

Your base walking speed is 25 feet.

You have a flying speed of 30 feet. To use this speed, you can’t be wearing medium or heavy armor.

When batfolk go to sleep they can choose to enter a state of torpor for 4 hours a day. While torpid, you must be hanging upside down. After resting in this way, you gain the same benefit that a human does from 8 hours of sleep.

You can speak, read, and write Common, Aarakocra, and Auran.