Shure AD651B Talk Back Switch New Open Box. Bought it not realizing all of the gear required to use it, so never put it to use, and couldn't return it at that point.
https://www.shure.com/en-US/products/accessories/ad651b
If item is returned as undeliverable or due to incorrect shipping
address, you will recieve a refund for the purchase price, minus actual
shipping cost, even if free shipping is selected.