Hollyland Cosmo C1 SDI/HDMI Wireless Video Transmission System : MY WAY VIDEO


Hollyland Cosmo C1 SDI/HDMI…


Hollyland Cosmo C1 SDI/HDMI Wireless Video Transmission System

Transmit up to a 1080p60 HDMI/SDI signal to an HDMI or dual SDI outputs
1000′ line-of-sight, uncompressed transmission with a low 40 ms latency
AES-128 encryption to prevent video leakage
Smart channel selection
Supports UVC pull streaming
SDI loop-through output on transmitter
5 GHz frequency band
OLED screen
USB Type-C power input option
L-series battery plates on back of each unit
Power with included DC adapter or with optional USB adapter




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Hollyland Cosmo C1 Overview

The Cosmo C1 SDI/HDMI Wireless Video Transmission System from Hollyland allows you to transmit up to 1080p60 video via HDMI/SDI inputs up to 1000′ line-of-sight with a low 40 ms latency to an HDMI or dual SDI outputs. The transmitter offers one HDMI input, one SDI input, and one SDI loop-through output, and the receiver offers two SDI outputs and one HDMI output.

The system operates on the 5 GHz frequency band and is encrypted to prevent video leakage. The system supports smart channel selection, allowing the system to choose the cleanest channel for transmission. It also supports UVC pull streaming. Both units also feature a bright, easy-to-read OLED display. Each unit is designed to be powered via an L-series battery plate, by the included D adapter, or with an optional USB power supply via the USB Type-C port. Four standard antennas and two mushroom antennas are supplied for the receiver and transmitter.

1,000FT Wireless SDI/HDMI Transmission System

This new member to the COSMO series, transformed by Hollyland’s HEVO wireless transmission technology, offers a new standard for real-time video monitoring up to 1,000ft line-of-sight. Boosted signal strength and superior anti-interference capability in the 5.1GHz- 5.8GHz frequency spectrum guarantee buttery smooth video transmission in complex environments. Industry-first to integrate UVC (USB Video Capture) interface, COSMO C1 offers a whole simplified solution to stream and cloud-share your video works.

It’s the new go-to choice to step up your content production teams to the next level.

No Flickering, No Black Screen

HEVO, The Game Changer

HEVO, a solution embedded with adaptive frequency hopping (AFH) and seamless retransmitting technology, brings exceptional
reliability, boosted signal strength, and superior anti-interference performance. You can now say goodbye to screen flickerings, screen pauses, and black screens throughout the production. With this level of anti-interference performance, it still allows 4 sets of video transmission systems to work at one location without compromising their smooth video delivery.

  • Real-time video transmission up to 1,000ft LOS
    Superior antiinterference in 5.1GHz-5.8GHz frequency spectrum

Channel Switching, You’ll Never Feel It

HEVO, Fast, Stable, and Smart

HEVO completes each synchronous frequency hopping in 0.001s at both receiving and transmitting ends that ensures picture integrity at the instant of frequency switching. Whether manual or auto-switching mode, your live streaming and production monitoring will no longer suffer black screens.

COSMO C1 has already completed thousands of channel switching when on-location directors or remote clients are monitoring the production in environments with complex wireless signals.

All You Need Is an USB-C Cable

Embeded Video Capture Like None Other

HEVO embeds UVC (USB Video Capture) into COSMO C1. It simply takes one USB-C to pass 1080P60 HD video quality to your computer for direct live streaming. No video capture device needed, no additional settings. It just works!

A Silver Bullet for Focus Puller

HEVO for Ultra Low Latency

HEVO, based on Hollyalnd’s self- developed protocol, improves coding efficiency by 30%. The acceleration module embedded in COSMO C1 achieves an ultra-low latency as low as 40ms. There is no compromise on image output and transmission latency within the 1,000ft LOS range.

Designed for precise follow focus and high image clarity, COSMO C1 is a silver bullet for videographers and focus pullers. Say Hi to a whole-new-level smooth viewing experience.

HDMI&SDI In/Out + SDI Loopout

A Wide Range Of Device Compatibility

COSMO C1 allows HDMI & SDI connections on both the TX and RX unit, plus an SDI loop-out on the TX. It can work with any mainstream camera, monitor, or switcher you happen to work on.

Your deal search ends here, period.

Battery Low Indicator

A Good Routine as “Save Your Work”

The low battery indicator in red is here to remind you 20 minutes in advance of a dying battery. No more last-minute panic.

Vertical & Horizontal Mount Design

Built to Match, Easy to Mount

More mounting methods are available on both the transmitter and receiver. The cold shoe mounting design at the front allows fixing and laying the unit horizontally, ideal for evening out the weight for balancing setup on camera and stabilizers, while the 1/4″-20 threaded hole erects the unit on any tripods.

Three Power Supply Options

Power That’s Nonstoppable

Three power supply options to escort in different shooting scenes. DC power supply is more suitable for use in an indoor project, while the L-series battery and USB-C port make the unit portable for your run and gun missions.

Patented Ball Catch Design

Locked To The Max

The patented ball catch des ign on the backplane can hold the NP-F series batteries firmly in place. Be rest assured of a steady power supply.

Hollyland Cosmo C1 Specs


Antenna PortsTransmitter/Receiver: 2 x RP-SMA Female
VideoTransmitter: 1 x BNC (3G-SDI) Input
Transmitter: 1 x HDMI Type A Input
Transmitter: 1 x BNC (3G-SDI) Loop Output
Receiver: 2 x BNC (3G-SDI) Output
Receiver: 1 x HDMI Type A Output
Embedded AudioHDMI/SDI: 2-Channel
PowerTransmitter/Receiver: 1 x Coax (16 VDC) Input
Other I/OTransmitter/Receiver: 1 x USB 3.1 / USB 3.2 Gen 1 (USB Type-C) Input
Encryption128-Bit AES


Wireless Range1000′ / 304.8 m
Channel Bandwidth40 MHz
Frequency RangeUS: 5.1 to 5.9 GHz
Latency40 ms

Format Support

Video FormatHDMI/SDI
1080p: 60
Wireless Video CompressionUncompressed


DC Input Power6 to 16 VDC
Battery TypeTransmitter/Receiver: 1 x L-Series


Mounting1 x Cold Shoe

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Weight9.595 lbs
Dimensions16 × 13.6 × 6.55 in


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