The H6 Handy from Zoom is a portable handheld recorder and USB audio interface that features an interchangeable microphone system.
In addition, the H6 is equipped with four XLR/TRS combo inputs for connecting external mic/line sources such as microphones or mixers. All four inputs and each of the mic modules are equipped with their own preamps with dedicated gain knobs that are easily accessible whether you have the unit mounted to your camera, or strapped over your shoulder. Also, each of the four combo inputs has its own -20dB pad.
The recorder allows you to record up to six channels at once and stores them to SDXC memory cards up to 128GB in size. It also features a backup-record option that tracks a duplicate of the left and right channels with -12db input gain. This means that if you find that you have tracked your main audio too loud and that distortion has occurred in your audio, you will have a backup stereo mix with 12 db more headroom as a fail-safe.