This is a set of MMCX drivers and an MMCX cable with a microphone and controller for use with Koss Porta Pro and Sporta Pro headphones. *Different colors are also available. Drivers are also sold separately. Bluetooth cable sets are also available. Please check my profile page. By replacing the drivers from your existing Porta Pro, you can convert them to MMCX. Also, by changing the MMCX cable to a Bluetooth cable, you can use them wirelessly. How about for repairing your Porta Pro that has been damaged? Cable Plug: 3.5mm 4-pole Connector: MMCX Length: 135cm Outer Material: High-precision nylon braid With microphone and volume control With a microphone, you can make calls when connected to a compatible smartphone. *Only drivers and cable are for sale. The main unit is not included, please be aware. *The photos show the product attached to the main unit for illustrative purposes. *The drivers are third-party products. *Due to the product specifications of embedding the MMCX connector, the cover of the connector part may be slightly raised. It is barely noticeable when attached to the main unit and does not affect use. Please understand that this is not a defective product. *Ear pad sponges are included. They are new. *The shape of the attachment part may differ slightly from the photo depending on the production lot. Please understand. Compatible with Porta Pro and Sporta Pro, you can convert your current Porta Pro to MMCX, re-cable, or Bluetooth simply by replacing the drivers. The drivers can be easily replaced by hand without using any tools. If you purchase this, you will receive the item in the second photo, and you can use it immediately after replacing it. Unused item, only used for connection check.