Starting at 4th level, you gain the ability to channel your artificer spells into objects for later use. You learn the Infuse Magic spell. 

Infuse Magic

1st-level transmutation. Casting Time: 1 action. Range: Self. Components: V, S, M (50 gp worth of powders, inks, and gemstones per level of the infused spell, in addition to that spell's components) Duration: Instantaneous

Select another artificer spell, you can increase its casting time by 10 minutes per level of the spell to infuse it into an item. Hold a nonmagical item throughout the casting. You expend a spell slot as if you had cast the spell, but none of the spell's effects occur. Instead, the spell transfers into that item for use as long as the item doesn't already contain a spell from this feature. While a spell is infused in this manner, you may not cast it using your spell slots until the infused item is destroyed or defused. 

Any creature holding the item thereafter can use an action to activate the spell if the creature has an intelligence score of at least 6. The spell is cast using your spellcasting ability, targeting the creature that activates the item. If the spell targets more than one creature, the creature that activates the item selects the additional targets. If the spell has an area of effect, it is centered on the item. If the spell's range is self, it targets the creature that activates the item. Once the item is used to activate the infused spell, it must be recharged by an artificer with the Infuse Magic feature during a short or long rest before it may be used again. 

You can have a limited number of infused spells at the same time. The number equals your intelligence modifier. By casting this spell again (using the infused item in lieu of other material components) on one of your infused items, you may destroy that item to regain the infused spell. Should an artificer infuse a new item that pushes them beyond their limit, another one of their infused items is destroyed, wherever it is.