This has an Apple-certified Lightning Audio Module with a three-button remote (volume up/down, hang up/call) and a separate mic module on the left ear cable closer to your mouth. This cable system enables digital audio playback with simultaneous cell phone operation. The RMCE-LTG is the first with MMCX ear bud connectors, providing digital iOS compatibility for all detachable Shure SE Sound Isolating™ earphones.

Shure also has the analog version called the Remote + Mic Accessory Cable RMCE also designed for detachable SE earphones but for conventional 3.5mm TRRS connectors. This cable has identical features as the digital RMCE-LTG.

I tried the RMCE-LTG with a pair of Shure SE215 earphones but you should know that both the LTG and analog cables work fine with the SE315, SE425, SE535, and SE846 earphones too.

I use an iPhone 6 (iOS 10.3.1) and the Lighting Connector has digital audio available and there was plenty of volume compared to my other analog (only) earphones--I had to crank down the volume on the cable to about half way. The SE215s are comfortable to wear and I liked the sound and operation of the DAC. The Shure RMCE-LTG is made well and they have a clear and warm sound.

The Remote + Mic Accessory Cable (RMCE) sells for $29.99 while the Remote + Mic Lightning Accessory Cable (RMCE-LTG) has a retail price of $99.99.