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Product Highlights
  • Tx/Rx Combo Transmission System
  • Up to 1080p Video Transmission
  • 305 m (1000') Range
  • 5.1 ~ 5.8 GHz Frequency
  • SDI / HDMI Video Format
  • SDI / HDMI / USB-C Interface
  • 6 ~ 16 V Power Source
  • < 9W Power
Hollyland COSMO C1 Wireless SDI/HDMI Transmission System Hollyland COSMO C1 Wireless SDI/HDMI Tra...
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  • Available in Toronto
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Cosmo C1
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 1000' line of sight. Boosted signal strength and superior anti-interference capability in the 5.1-5.8 GHz frequency spectrum guarantee buttery-smooth video transmission in complex environments.

Key Features:

  • HEVO Solution
  • Embedded UVC for direct livestream
  • Ultra-Low Latency
  • Seamless Channel Switch
  • Frequency: 5.1-5.8 GHz
  • HDMI & SDI
  • 1000' Range
  • Full HD (1080p at 60 fps)
  • Multiple Power Options

Industry-first to integrate UVC (USB Video Class) interface, COSMO C1 offers a whole simplified solution to stream and cloud-share your video works. Its the new go-to choice to step up your content production teams to the next level.

No Flickering, No Black Screen

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.

Channel Switching, You'll Never Feel It

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 on manual or auto-switching mode, your live streaming and production monitoring will no longer suffer black screens.

All You Need Is A USB-C Cable

With HEVO, UVC is embedded in Cosmo C1. It simply take on USB-C to pass 1080p60 HD video 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, based on Hollyland's self-developed protocol, improves coding efficiency by 30% with H.265 (HEVC). 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 1000' LOS range.

HDMI & SDI In/Out + SDI Loopout

Cosmo C1 allows HDMI & SDI connections on both the Tx & Rx unit, plus an SDI loopout on the Tx. It can work with any mainstream camera, monitor or switcher you happen to work on. Your deal search ends here, period.

Locked to the Max

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

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.

Built to match, easy to mount

More mounting methods are available on both the transmitter and receiver. The cold show 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

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

Cosmo C1 Applications

The one ideal tool for pro filmmaking, micro-events live streaming, commercial shooting etc.

What's Included

Cosmo C1 Wireless SDI/HDMI Transmission System
4x Antennas
2x Mushroom Antennas
Cold Shoe
Magic Arm
Type-C Converter
DC Adapter
User Guide
Expansion Accessory


Product Specifications

Cosmo C1 Wireless SDI/HDMI Transmission System


Interfaces Antenna Interface (RP-SMA Male)
HDMI Input (Type A Female)
SDI Input
SDI Loopout
DC Input
Power Supply DC Power Input: 6~16V
USB-C Power Supply: 5V / 2A
Battery Power Supply: 6-16 V
Power < 9W
Weight 214 g ( oz)
Dimensions 11.5 x 7 x 3.2 cm (")
Input / Output Video Format HDMI:
1080p60/59.94/50 (Level A)
1080p60/59.94/50 (Level B)
Frequency 5.1 ~ 5.8 GHz
Transmission Power Max. 22dBm
Transmission Latency As low as 40ms
Bandwidth 20 MHz


Interfaces Antenna Interface (RP-SMA Male)
HDMI Output (Type A Female)
SDI Output * 2
DC Input
Power Supply DC Power Input: 6~16V
USB-C Power Supply: 5V / 2A
Battery Power Supply: 6-16 V
Power < 9W
Weight 210 g ( oz)
Dimensions 11.5 x 7 x 3.2 cm (")
Input/ Output Video Format HDMI:
1080p60/50 (Level A)
Frequency 5.1 GHz ~ 5.8 GHz
Receiver Sensitivity -80 dBm
Transmision Latency As low as 40ms
Bandwidth 20 MHz

Questions & Answers

Hollyland COSMO C1 Wireless SDI/HDMI Transmission System

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Contact us today for a personal touch.