From Brotato Wiki
Recycling Machine is a unique item. Only 1 of each unique item can be equipped, and it will then no longer be offered in the Shop, and no longer drop from loot crates.
The Default is to get 25% back when recycling. Recycling Machine can increase this value by 35% for a total of 60% back.
This stacks with the +25% from Entrepreneur for a total of 85%. Rewards for recycling are based upon the current price of the item, so it increases with inflation, but decreases if you have coupons, since it scales with your shop price secondary stat.