P1029183-001 Zebra QLn Series Serial Cable. These cables are used for connecting Zebra QLn mobile printers to other devices, such as host computers or scanners. 

Key details about this type of cable include:

Compatibility: Designed for use with Zebra QLn220, QLn320, and QLn420 mobile printers, and ZQ600 series

I got this with a storage lot from a local store that went out of business I don't think that they would have kept them had they not worked but I have no way to test them so they are being sold as is and untested.