MARS 300 PRO has a hassle-free wireless video and audio transmission range over 300ft with a clean line of sight (LOS) and with 0.08s lowest achievable ultra-low latency. It has eight frequency channel options that can be switched to avoid interference and to ensure a stable wireless transmission just like other transmitters in their MARS product line.


One of the most stand-out features is the mobile App real-time monitoring. When the receiver is connected to an external monitor on a regular setup, two more mobile devices can be connected to the transmitter via their HollyView monitoring App that people can find in Google Play and iOS App Store. The transmitter can also be used alone, which would allow the system to connect up to three mobile devices monitoring.

There are two HDMI outputs on the receiver while the transmitter comes with an HDMI input and an HDMI loopout that is essential for people who like to build cinematic rigs with mirrorless or other small-budget cameras and need an on-camera external monitor.

The App itself supports pro monitor features, such as waveform, focus peaking, zebra, zoom, 3D luts, screen recording, and screenshots that people can make simple notes and share them with others, etc.

The following is a typical setup for the application of the MARS 300 PRO wireless transmission system.


A 3-in-1 thumbwheel switch menu is added to MARS 300 PRO together with a side OLED screen with easy access to the device’s power status, channel scan result, video input, channel number, etc., so now people don’t have to worry about having their screen blocked when they mount their systems horizontally on the camera.

The downside of having a built-in fan is the fan noise. The solution Hollyland comes up with is the ability to adjust the fan speed in order to have the fan noise under control. Regular speed to keep the fan running at its own pace, or low speed for quiet mode when one sets a microphone next to the transmitter.

MARS 300 PRO also comes with channel scan on both the receiver and the App, so people can easily identify the best channel to use on a shooting location ahead of time, or anytime. Hollyland also puts the firmware upgrade to both the device and their HollyView App that makes it less-hassle when it comes to system updates.

People also have different powering options for MARS 300 PRO. It supports 5-12V wide voltage power supply, including various L-series batteries, different power banks, and Type-C charging.


MARS 300 PRO also comes with two different versions,

1.    the STANDARD version

2.    the ENHANCED version

Built-in antennas are introduced to MARS 300 PRO for easy setup, efficient shooting, and different shooting applications. Both versions come with receivers with built-in antennas. The transmitter is also with built-in antennas for the standard version, while external antennas are used on the transmitter for the enhanced version. The only difference between these two versions is the antennas, namely, the ability to avoid interference for complex Wi-Fi environments.

Besides these two packing options, they have also added the single transmitter packing as the third purchasing option, which means now, people don’t have to go for a full transmitter and receiver set if they just need the App monitoring feature plus the on-camera external monitor connection option.