The Kenwood KPG-46X USB programming cable is designed to work the TM-271A and TM-281A.
The 4.9 foot USB 2.0 compliant cable is USB to 8-conductor RJ type modular and simply connects to radios' microphone jack.
This kit comes with a Windows driver CD.
The KPG-46U requires Windows Vista® (32/64-bit)/Windows® 7 (32/64-bit)/Windows® 8 (32/64-bit)/Windows® 8.1 (32/64-bit).
The Kenwood KPG-46X has replaced the earlier KPG-46U.