Crossbow Expertise A5E
If proficient with a crossbow, you ignore its loading property.
You do not have disadvantage on ranged attack rolls from being within 5 feet of a hostile creature.
When you attack with a one-handed weapon using the Attack action, you can use a bonus action to attack with a hand crossbow wielded in your off-hand.
Source: Adventurer's Guide (EN Publishing) · License: Creative Commons Attribution 4.0 / OPEN GAME LICENSE Version 1.0a details