Cosmo C1 Wireless Video Transmission System

The Hollyland Cosmo C1 is a professional wireless video transmission system built for filmmaking, live streaming, and commercial shooting. It uses the latest encoding and decoding technology alongside 5G wireless transmission to deliver ultra-low latency and reliable performance. Whether you work on a professional film set or a smaller live event, the Cosmo C1 gives you the tools to keep your signal clean and your workflow moving.

HEVO Technology – No Flicker, No Black Screen

The Cosmo C1 is powered by HEVO, a seamless transmission technology built on Adaptive Frequency Hopping (AFH). It completes synchronous frequency hopping at both ends in just 0.001 seconds, so you never see a black screen during a channel switch. In both auto and manual switch modes, your live stream and production monitoring stay clean and uninterrupted. As a result, flickering, pauses, and signal drops are a thing of the past.

HEVO also improves coding efficiency by 30% using H.265 (HEVC). Combined with an embedded acceleration module, the Cosmo C1 achieves an ultra-low latency of just 0.04 seconds. This makes it a reliable tool for focus pullers who need precise and real-time feedback on every shot.

1,000ft Range with HDMI and SDI

The Cosmo C1 delivers a transmission range of over 1,000ft / 300m with a clean line of sight when one transmitter is connected to one receiver. Both the transmitter and receiver support HDMI and SDI connections, and the transmitter also includes an SDI loopout interface. This makes it compatible with any mainstream camera, monitor, or switcher on set.

Direct Live Streaming via USB-C

With built-in UVC, the Cosmo C1 lets you stream 1080p60 HD video directly to your computer using just a single USB-C cable. There is no need for a video capture device or additional software settings. Simply plug in and go. This makes it an incredibly convenient option for live streaming and video conferencing setups.

Flexible Mounting and Reliable Power

The Cosmo C1 supports both vertical and horizontal mounting. A cold shoe mount at the front lets you fix the device horizontally, making it ideal for balanced setups on cameras and stabilizers. A 1/4″-20 threaded hole also allows mounting on any tripod. For power, three options are available. DC power suits indoor use, while NP-F batteries and USB-C charging support run-and-gun mobility. The patented ball catch design holds the NP-F battery firmly in place, and a red LED low-battery indicator gives you advance warning before power runs out.

Key Features

• 5G wireless transmission with over 1,000ft / 300m LOS range
• 0.04s ultra-low latency via HEVO technology and H.265 (HEVC) encoding
• Adaptive Frequency Hopping (AFH) with 0.001s synchronous channel switching
• No black screen in auto or manual frequency switch mode
• HDMI and SDI input/output on both TX and RX
• SDI loopout interface on the transmitter
• Built-in UVC for direct 1080p60 streaming via USB-C — no capture card needed
• Patented ball catch design for secure NP-F battery mounting
• Red LED low-battery indicator for advance power warning
• Cold shoe front mount for horizontal placement on cameras and stabilizers
• 1/4″-20 threaded hole for tripod mounting
• Three power options — DC input, NP-F battery, and USB-C charging
• Ideal for professional filmmaking, live streaming, and commercial shooting