This kit is a leather pouch containing bandages, salves, and splints. The kit has ten uses. As an action, you can expend one use of the kit to stabilize a creature that has 0 hit points, without needing to make a Medicine check.

With Medicine Proficiency: When you use a healer’s kit to stabilize a dying creature, that creature also regains 1 hit point and consciousness.
    As an action, you can spend one use of a healer’s kit to tend to a creature and restore 1d6 + 4 hit points to it, plus additional hit points equal to the creature’s maximum number of Hit Dice. The creature can’t regain hit points from any kit again until it finishes a short or long rest.