This is the two pack of the original DJI mic. Includes: 2x Wireless Recorder/Transmitters (built in memory, the transmitters record locally as we as send to camera via receiver cold shoe) x1 Receiver (mounts to a cold shoe with included attachment, use included mic cable to connect to camera for audio from Transmitters) x1 Charger/Case (the case fits both Transmitters, the Receiver as well as the cold shoe mount and attachments to convert the Receiver to work with iPhone or Android) x 2 Dead Cats for Transmitters x 1 Quick Start Manual x1 Receiver to Camera Audio Cable These work well and sound great. I'm upgrading to something more robust from sound devices and no longer need this. Key Features 2-Person Interviews, Videos, Streaming Connects to Cameras, iOS/Android Devices 2 x Clip-On Transmitter/Recorder Mics Compact 2-Channel Receiver Records 14 Hours of Audio Bright OLED Display, Headphone Out USB Audio Interface Functionality Internal 5-Hour Batteries, Charging Case Up to 820' Wireless Range