The HD-SDI output is essential for studios and most professional video production setups. This feature allows the camcorder to output the signal to a monitor or recording device with ease. You can also use the HD-SDI to genlock HD camcorders for a multi-cam setup.
The B&H package includes a variety of accessories that every professional needs. These include a microphone, lens hood, battery and charger, and an SD card. This kit provides everything needed to start shooting in Ultra HD quality.
Source: https://digitalfilmmaker.net/capture-high-quality-video-with-the-jvc-gy-hm180u-4k-camcorder/