Brownies have an innate ability to become invisible at will to mortals.  This effect last until they interact with an object or attack a creature.  They still can be seen by immortal creatures and true sight.

Brownies can cast Dimension Door 2x Per Long Rest; 3x after Level 12

Brownies can move through the space of any creature that is of a size large than yours

Brownies tend to befriend a mammal of normal sizes that they normally travel with if they so choose

Brownies have advantage versus charms and can't be put to sleep

Your Dexterity Score increases by 2

Can see in the dark 60 feet

Stealth +5

Can speak and write Sylvan and Common

Any weapon a halfling can be proficient in

any armor that is customized to size

Brownie innate Spellcasting ability - Wisdom DC 13

At Will:  Druidcraft, Goodberry

1/Day:  Dancing Lights

Brownies can use any magic item that can be used by fighters, dwarves, or halflings.

When using a magic item that can be used by a magic user, elf, or fae spellcaster (for the first time), roll a Percentile Die

Roll                          Result

01-10                        Success

11-89                        Fail

90-98                        Backfire

99-100                      Unexpected Result