Check the listing for details. ELECRAFT K3 KUSB CABLE - CONNECTS K3 TO YOUR COMPUTER - MUST HAVE !. Condition: Open box. Listed at 31.88 USD. ELECRAFT K3 KUSB CABLE - CONNECTS K3 TO YOUR COMPUTER - MUST HAVE !I have a few different ones,and they all work fine.This cable will connect your K3 to your computer USB port...These are cables that came with K3 radios that I have purchased.I use one of these just about every day to update firmware ,or configure filters.The KUSB cable is a USB to RS232 adapter cable intended to support the connection the K3 Utility to the original K3, KPA500 and other Elecraft products. It is supported on Windows, MacIntosh and x86 Linux operating systems.The KUSB cable enables computer communication with a number of Elecraft's products including, the KPA500, K3, P3, KRC2, W2 and K2.Please see pictures for more details.Local pickup is also fine.I can be reached through QRZ if you have questions about this unit.Larry K6RO