Your search for "qdd-400g-dr4" revealed the following:

Arista QSFP-100G-DR 100GB BASE-DR 500m SMF QSFP28 Transceiver

SKU: NSB-5286
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Arista QSFP-100G-FR 100GB BASE-FR up to 2km over duplex SMF QSFP28

SKU: NSN-6740
Condition: New
Shipping: Overnight Options
Warranty: 365 days