The Saramonic Blink 500 ProX RXDi is an incredibly compact and lightweight device-mountable dual receiver with Lightning output for up to two Blink 500 ProX TX transmitters. It is designed to add a Lightning Receiver to your Blink 500 ProX B1, B2, B5 or B6 wireless systems, and be a spare or replacement for a lost or damaged receiver for your Blink 500 ProX B3 or B4 wireless system. The receiver sleekly mounts into the Lightning port of Apple iPhones and iPads, adding hardly any additional weight to your iOS device. **Designed exclusively for the Blink 500 ProX Transmitters, and will not work with the Blink 500 or Blink 500 Pro transmitters** For iPhone and iPad with Lightning The Blink 500 ProX RXDi dual-channel receiver plugs right in and mounts to the iOS device's Lightning port. Allowing the system to work perfectly with your iPhone or iPad. A 3.5mm headphone output lets you monitor the sound in real-time, even if your app does not allow real-time monitoring. Absolutely vital to ensure you're getting the best sound when recording, and finally allowing you to hear the other participants in virtual meetings, FaceTime, and video call apps in real-time. The RXDi also features a much-desired selectable Mono / Stereo output setting, giving you the ability either record each mic to separate channels, or mix the mics into your iOS device's video or audio recording app. Expandable System for Incredible Versatility and Power The Blink 500 ProX RXDi receiver is an ideal expansion for the remarkable Blink 500 ProX B1, B2, B5 and B6 systems. Letting you easily expand your current ProX system to have a dual Lightning receiver for iPhones and iPads for more flexibility. And unlike some other 2.4GHz systems, because it is a full-featured dual wireless receiver, you don't have to sacrifice functionality like Mono/Stereo recording or Real-Time monitoring from the iOS device.