Chests have a 50% chance of paying out with extra pickups and a 50% chance of paying out with nothing or enemies.
Quote
"It's double down time!"
Effects
If a chest would contain hearts, coins, bombs and/or keys, it has a 50/50 chance to either drop extra consumables or replace all of its contents with an Attack Fly.
The trinket has no effect on Red Chests, or if the chest would contain a pill, a card, a trinket or an item.
Consequently, the Chip has no effect in The Chest or Dark Room.