You have advantage on Perception checks that rely on hearing.

Additionally, you have blindsight to a radius of 120 feet, and automatically see through visual illusions and succeed on checks against them. You must make an audible squeaking noise to activate this sense and have disadvantage on any Stealth checks when attempting to use it. You cannot use this ability while deafened.

You have a flight speed of 40 feet, but must either land when your movement is over, or take a Dash action on the same turn to maintain your position in the air. To use this speed, you cannot be wearing medium or heavy armor. Additionally, any clothing or light armor you wear must be specially modified to accommodate your wingspan.

Chiropterans have a climb speed of 25 feet and can hang from upside down or vertical surfaces (provided there is something they can grip with their feet) for extended periods of time with no effort.

You can speak, read, and write in Common, Chiropteran, and Undercommon. Chiropteran has no written language, and is conveyed in a series of subsonic squeaks inaudible to most races' ears. 

Chiropterans reach maturity early, but don't live quite as long as humans. They are considered adults at 5 years old, and live to be around 60.

You have disadvantage on attack rolls and on 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 Dexterity increases by 2 and your Wisdom increases by 1.