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Deliver Full HD video over long distances using this Cosmo C2 HDMI/SDI Wireless Video Transmitter from Hollyland. The transmitter features HDMI and SDI inputs, an SDI loop output, and has a 33 ms latency that facilitates line-of-sight transmission of 1080p60 video up to 3000' away. Integrated HEVO 2.0 technology with seamless frequency hopping automatically detects surrounding interference and switches to a clean channel within its supported 5.1 to 5.85 GHz frequency bands for uninterrupted transmission. UVC via USB-C OTC adapter and embedded RTMP streaming conduct real-time streaming and transmission to social media platforms and personal computers. The unit can be powered via DC input or an L-series battery.
Deliver Full HD video over long distances using this Cosmo C2 HDMI/SDI Wireless Video Transmitter from Hollyland. The transmitter features HDMI and SDI inputs, an SDI loop output, and has a 33 ms latency that facilitates line-of-sight transmission of 1080p60 video up to 3000' away. Integrated HEVO 2.0 technology with seamless frequency hopping automatically detects surrounding interference and switches to a clean channel within its supported 5.1 to 5.85 GHz frequency bands for uninterrupted transmission. UVC via USB-C OTC adapter and embedded RTMP streaming conduct real-time streaming and transmission to social media platforms and personal computers. The unit can be powered via DC input or an L-series battery.
Strong Signal Strength
The Cosmo C2 broadcast technology enables up to two transmitters to connect to a separately available receiver with stable signals. At a transmission range of up to 3000', the Cosmo C2 features latency as low as 33 ms.
Seamless Frequency Hopping
Cosmo C2 automatically detects surrounding frequency interference and seamlessly switches to a clean channel within its 5.1 to 5.85 GHz bands using HEVO 2.0 technology. This makes for uninterrupted transmission and an immersive experience.
UVC and RTMP Streaming
When the separately available receiver unit is plugged into a computer, and the included USB-C OTG adapter is plugged into the transmitter, Cosmo C2 unlocks UVC compatibility. Directly connect to your computer without requiring capture cards for real-time video transmission. Cosmo C2 also unlocks RTMP streaming for direct live streaming to YouTube, Twitch, and other platforms.
Multiple Power Options
The transmitter features a locking DC input and an L-series battery plate for multiple power options depending on your location.
Dual Transmitter Single Receiver Setup
Designed for multi-camera workflows, the Cosmo C2 supports two transmitters feeding into one receiver—ideal for multi-cam shoots and live streaming setups.  
Excellent Range & Low Latency
Offers up to 1,000 m (3,000 ft) line-of-sight range with ~33 ms latency, ensuring stable, real-time video transmission for production environments.
Works very well
By Tony
Rated 5 out of 5
Date: 2025-07-30
Used it for a concert inside a Hotel room and had zero issues. I did have an issue at another venue when going through doors I lost signal then when back out I'd have to turn the receiver off and back on for it to sync back up. Still working on why that is.
See any errors on this page?
Can we link the Hollyland Cosmo C1 transmitter ...
Can we link the Hollyland Cosmo C1 transmitter with the Hollyland Cosmo C2 receiver and use them together?
Asked by: Muhammad Tayyab
Unfortunately, the Hollyland Cosmo C2 HDMI/SDI Wireless Video Transmission System is not compatible with the Cosmo C1.
Answered by: Dennis L
Date published: 2025-02-13
Can it be mount on a camera like a V-Mount ...
Can it be mount on a camera like a V-Mount accessory? On an URSA Broadcast Camera.
Asked by: Felix
No, at this current time the Hollyland Cosmo C2 HDMI/SDI Wireless Video 2-Transmitter System does not have a battery mount option that would allow it to connect to broadcast cameras like the URSA v-mount and pass battery power to the camera.
Answered by: Chris H
Date published: 2025-12-04
Is the cosmo c2 kit compatible with pyro 7?
Is the cosmo c2 kit compatible with pyro 7?
Asked by: Sid
Unfortunately, the Hollyland Cosmo C2 HDMI/SDI Wireless Video Transmission System is not compatible with the Mars or Pyro series, or the Cosmo C1.
Answered by: Chris H
Date published: 2025-04-09
Is there an option for L series battery plate for ...
Is there an option for L series battery plate for the receiver?
Asked by: jonathan
If you would like to work with L-Series batteries on the Hollyland Cosmo C2 HDMI/SDI Wireless Video 2-Transmitter Systems receiver, please consider the Hedbox converter plate listed below:
Hedbox Power V-Lock Plate Dual L-Series
BH #HEHBPNPF
Answered by: Chris H
Date published: 2025-02-13
if my cameras are connected with SDI, can i use ...
if my cameras are connected with SDI, can i use the HDMI out from the receiver?
Asked by: kiel
Yes, the Hollyland Cosmo C2 HDMI/SDI Wireless Video 2-Transmitter System supports SDI to HDMI cross conversion so you could monitor via the HDMI output on the receiver.
Answered by: Chris H
Date published: 2025-10-30
Can these units be used in combination with the Ho
Can these units be used in combination with the Hollyland pyro 7?
Asked by: Daniel
The Hollyland Cosmo C2 HDMI/SDI Wireless Video 2-Transmitter System is not compatible with Mars or Pyro series, but you can connect this set to the Pyro 7 manual via HDMI or SDI.
Answered by: Whitney H
Date published: 2026-03-31
Is there a way I can use this to tether my camera ...
Is there a way I can use this to tether my camera to my laptop during photos shoot?
Asked by: Deji
No, the Hollyland Cosmo C2 HDMI/SDI Wireless Video Transmission System is not designed for tethering.
Answered by: John W
Date published: 2025-11-28
I’m working on a project with 3 cameras. It’s ...
I’m working on a project with 3 cameras. It’s possible to add a 3rd transmitter to the same receiver? Or need xtra combo?
Asked by: Felix
No, there is a maximum of 2 transmissions that can be received by the receiver of the Hollyland Cosmo C2 HDMI/SDI Wireless Video 2-Transmitter System.
