Your Wisdom increases by 2, and your Dexterity increases by 1. 

Bat folk reach maturity at age 5, and typically don’t live longer than 60 years. 

Bat folk are between 2 and 3 feet tall and weigh between 30 and 40 pounds. Your size is Small.

Your base walking speed is 30 feet.

You can see in dim light within 60 feet of you as if it were bright light, and in darkness as if it were dim light. You can’t discern color in darkness, only shades of gray.

Using your wings, you can slow your fall, and glide short distances. When falling you can use your reaction to spread your wings and slow your descent. While doing so, you continue to fall gently at a speed of 60 feet per round, taking no fall damage when you land. If you would fall at least 10 feet in this way, you may fly up to your movement speed in one direction you choose, although you cannot choose to move upwards, landing in the space you finish your movement. You cannot glide while carrying heavy weapons or wielding a shield (though you may drop any held items as part of your reaction to spread your wings). You cannot glide while wearing heavy armor, or if you are encumbered.

Using your sonar, you can detect your surroundings without the use of sight, up to a 60 foot radius. You can't use your echolocation while deafened or incapacitated. 

You have advantage on Wisdom (Perception) checks that rely on hearing.

While in sunlight, you have disadvantage on attack rolls, as well as on Wisdom (Perception) checks that rely on sight.

You are proficient with this natural weapon, which deals 1d4 + STR or DEX piercing damage on a hit.

You can speak, read, and write Common and Undercommon.