def searchKey(usb_dict, ids):
    """
    Compare provided IDs to the built USB dictionary. If found, it will return
    the common name, otherwise returns the string "Unknown"
    """

    vendor_key = ids[0]
    product_key = ids[1]

    try:
        vendor = usb_dict[vendor_key][0]
    except KeyError:
        vendor = 'Unknown'
    try:
        product = usb_dict[vendor_key][1][product_key]
    except KeyError:
        product = 'Unknown'
    return vendor, product