Hollyland COSMO C1 Wireless SDI/HDMI Transmission System
SKU: 320813313

Hollyland COSMO C1 Wireless SDI/HDMI Transmission System

Sale price$346.05 Regular price$384.50
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Description

Hollyland COSMO C1 Wireless SDI/HDMI Transmission SystemThe newest member of Hollylands COSMO series, the COSMO C1, establishes a new standard for real time video monitoring at up to 1,000ft line of sight, thanks to Hollyland's transformative HEVO wireless transmission technology. With COSMO C1, you finally have a complete, but simple, solution for streaming and cloud sharing your video creativity. Designed for precise follow focus and high image clarity, COSMO C1 is a silver bullet for videographers and

The newest member of Hollyland’s COSMO series, the COSMO C1, establishes a new standard for real-time video monitoring at up to 1,000ft line-of-sight, thanks to Hollyland's transformative HEVO wireless transmission technology. With COSMO C1, you finally have a complete, but simple, solution for streaming and cloud-sharing your video creativity. Designed for precise follow focus and high image clarity, COSMO C1 is a silver bullet for videographers and focus pullers. It’s time to say “Hi” to a whole-new smooth viewing experience.

Smooth video, even in challenging situations

COSMO C1’s boosted signal strength and superior anti-interference capability in the 5.1GHz-5.8GHz spectrum guarantee buttery-smooth video transmission, even in complex environments. The COSMO C1 is also the first in its field to integrate UVC (USB Video Capture) technology, COSMO C1 offers a whole simplified solution to stream and cloud-share your video works.

HEVO uses adaptive frequency hopping (AFH), in only 0.001 seconds, at both receiving and transmitting ends, plus seamless re-transmission technology. Together, these features give you exceptional reliability, boosted signal strength, and superior anti-interference performance. No matter whether you’re using manual or auto-switching modes, you can wave goodbye to flickering, glitches, and black screens. Moreover, you can simultaneously run four of these video transmission systems at one location without compromising on smooth video delivery.

Simple USB-C connectivity

With COSMO C1, you only need one USB-C connection to provide full 1080P60 HD video quality to a computer for direct live streaming, thanks to HEVO’s support for UVC (USB Video Capture). There’s no video capture device needed, and no additional settings. You just have to connect one simple USB-C cable and it just works!

HEVO brings ultra-low latency and glitch-free performance

Based on Hollyland's self-developed protocol, HEVO technology improves video coding efficiency by 30%. The acceleration module embedded in COSMO C1 achieves ultra-low latency as low as 40ms, aided by HEVO’s fast adaptive frequency hopping (AFH) and seamless retransmitting technology. There is no compromise on image output and transmission latency within a wide 1,000ft LOS range.

Unparalleled compatibility and flexibility

COSMO C1 supports HDMI and SDI connections on both TX and RX units, plus an SDI loop-out on the TX unit. It can work with any mainstream camera, monitor, or switcher. In addition, there are three power supply options to escort in different shooting scenes. DC power supply is great for indoor projects, while the N-PF/L-series battery and power-capable USB-C port help make the unit portable for run and gun missions. The red low battery indicator lets you know when you have 20 minutes of battery power remaining, to prevent last-minute panics.

Provides everything you need

The COSMO C1’s highlights include up to 1,000ft LOS range, superior anti-interference making it possible to run four systems at one location, HEVO for low latency and stable frequency hopping, full 1080P60 HD video over a single USB cable, vertical and horizontal mounting options, and three versatile power supply options.

Features

  • As low as 40ms Transmission Latency                                                     
  • 1000ft Wireless Transmission Range (LOS)                                 
  • Supports Smart Channel Selection
  • Transmitter Supports SDI Input, HDMI Input, and SDI Loop out.
  • Receiver Supports 2*SDI Outputs and HDMI output
  • Supports DC Power Supply, Battery, and USB Type-C Power Supply
  • Supports UVC Pull-streaming

In the Box:

  • 1x Transmitter
  • 1x Receiver   
  • 4x Antenna
  • 2x Mushroom Antenna
  • 1x Cold Shoe
  • 1x Magic Arm
  • 1x Type-C Converter
  • 1x DC Adapter
  • Warranty Card     
  • Expansion Accessory       

Specifications

 

Transmitter

Receiver

Interfaces

Antenna Interface(RP-SMA Male)

HDMI Input(Type A Female)

SDI Input

SDI Loopout

DC Input

USB Type-C

Antenna Interface(RP-SMA Male)

HDMI Input(Type A Female)

SDI Output*2

DC Input

USB Type-C

Power Supply 

DC Power Input: 6~16V

USB Type-C Power Supply: 5V/2A

Battery Power Supply: 6-16V 

DC Power Input: 6~16V

USB Type-C Power Supply: 5V/2A

Battery Power Supply: 6-16V  

Power Consumption

<9W

<9W

Weight

214g(Without Exterior Antenna)

210g(Without Exterior Antenna)

Dimension

(L*W*H) 115*70*32mm(Battery Plate Excluded)

(L*W*H) 115*70*32mm(Battery Plate Excluded)

Input/Output Video Format

HDMI:

480p60
576p50
720p50/59.94/60

1080i50/59.94/60

1080p23.98/24/25/29.9/30
1080p50/59.94/60

 

SDI:
1080p60/59.94/50(Level A)

1080p60/59.94/50(Level B)

1080i60/59.94/50

1080p30/29.97/25/24/23.98
1080psf25

720p60/59.94/50

1080psf24/23.98

HDMI:

480p60

576p50

720p50/60

1080i50/60

1080p24/25/30

1080p50/60

 

SDI:

1080p60/59/50(Level A)

1080i60/59/50

1080p30/29/25/24/23

1080psf25/24/23

720p60/59/50

Frequency

5.1GHz~5.8GHz

5.1GHz~5.8GHz

Transmission Power

Maximum 22dBm

 

Receiver Sensitivity

 

-80dBm

Transmission Latency

As low as 40ms

Bandwidth

20MHz

20MHz

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 320813313

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Nancy Sullivan
San Leandro, US
★★★★★ 5
Love size. And it’s comfortable
Color: Apricot Pink, Size: M-17.7 X 13.8 Inch
This travel pillow is firm but yet soft I was impressed with it and I love the size.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 22, 2026
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Emily
Pawtucket, US
★★★★★ 5
A Travel Pillow That Actually Works!
Color: Sky Blue, Size: M-17.7 X 13.8 Inch
I fly fairly often and have gone through a few different pillows that I thought would be great but left me disappointed! I’m honestly so happy with this pillow. It fits easily in my backpack, and it doesn’t look ridiculous if I hanging it on my backpack if I’m packing a lot. It’s thick enough to support my head against the window/wall without feeling too bulky. I usually sleep really poorly on planes, and I’m not going to say that this was the magic charm, but I definitely slept more comfortably. It’s also great support against your lower back if you’re not sleeping. Some have mentioned a smell, but honestly it just smells like memory foam usually does and it’s not overpowering. I’ve only used for a few flights so far but I love it!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 22, 2026
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Darth Vader
Natrona Heights, US
★★★★★ 3
Nice travel pillow
Color: Apricot Pink, Size: S-16 X 12 Inch
Works well as a pillow to support my elbow while I’m driving. It was too full to use as a pillow to place my head on at night since I am a side sleeper. There is no way to remove some of the memory foam to make it flat enough to use as my bedtime pillow. I liked the soft pink zippered cover as it works well and makes it easy to remove and wash. I didn’t notice any smell.
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Reviewed in the United States on March 18, 2026
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Jac
Belleville, US
★★★★★ 5
Great little pillow
Color: White & Light Blue, Size: S - 16 x 12 Inch
Works perfectly since stuffing can be removed to make it just the right thickness needed for you. Soft & cool to put your head on plus very well made with quality materials.
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Reviewed in the United States on May 14, 2026
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Darth Vader
Charlottesville, US
★★★★★ 5
Great adjustable travel and sleep memory foam pillow
Color: White & Light Blue, Size: M - 18 x 13 Inch
Perfect travel pillow. You can change how “fluffy” the pillow is by opening the zipper and removing some of the memory foam. Once I did this, it was the perfect supportive pillow to sleep on at night when I travel. I am a side sleeper and this pillow worked really well. It has one side that has cooling material and one side that has regular material. I followed the instructions to let the pillow air out for 24 hours and never noticed a smell.
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Reviewed in the United States on March 18, 2026

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