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COSMO C1 Wireless SDI/HDMI Video Transmission System



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The Hollyland COSMO C1 Wireless SDI/HDMI Video Transmission System utilises cutting-edge coding and decoding technology, as well as 5G wireless transmission technology, to achieve remarkably low latency in wireless video communication. Its impressive range of over 300m is only possible with a clear line of sight between the transmitter and its single receiver. The L-series battery plate equipping both transmitter and receiver, along with USB Type-C and DC power inputs, provides multiple power options.

Adaptive Frequency Hopping

Improve the reliability, signal strength, and anti-interference capabilities of your production with HEVO, a cutting-edge transmission technology utilizing adaptive frequency hopping (AFH). Say farewell to flickering, pauses, and black screens.

Seamless Channel Switch — You'll Never See It

The HEVO system achieves synchronous frequency hopping in a mere 0.001s at both the receiving and transmitting ends, ensuring seamless picture integrity during frequency switches. Whether in auto or manual switch mode, you can enjoy uninterrupted live streaming and production monitoring without any black screens.

All You Need Is a USB-C Cable

The Cosmo C1 incorporates HEVO, embedding UVC technology for streamlined operation. With just one USB-C cable, it seamlessly transmits 1080p60 HD videos to your computer, allowing for direct live streaming without the need for a video capture device or additional settings. The process is simple and straightforward, requiring no additional effort from the user.

Note: The embedded UVC is only for progressive (p) scan signals.

A Silver Bullet For Focus Puller

Utilizing Hollyland's self-developed protocol, HEVO increases coding efficiency by 30% through the use of H.265 (HEVC). The Cosmo C1's built-in acceleration module achieves an incredibly low latency of 0.04s, maintaining high-quality image output and minimal transmission delay within a 1,000ft (300m) line of sight range.


The Cosmo C1 enables both HDMI and SDI connections on both the TX and RX, as well as an SDI LOOPOUT interface on the TX. With compatibility for a wide range of cameras, monitors, and switchers, this device is a comprehensive solution for all your video transmission needs.

Patented Ball Catch Design

The innovative ball catch design on the backplane securely holds the NP-F battery in position, providing a reliable power source.

A Good Routine to “Save Your Work”

The inclusion of a low-battery indicator on the device prevents last-minute emergencies, as the red LED will provide a warning beforehand of a depleted battery.

Built to Match & Easy to Mount

Introducing the COSMO C1 Wireless SDI/HDMI Video Transmission System, designed with more mounting options for convenient and balanced setup on cameras and stabilizers. With a cold shoe design and a 1/4"-20 threaded hole, easily attach the device to any tripod for on-the-go filming. Expertly crafted for seamless and efficient video transmission.

Three Power Supply Options

Three different power supply options are offered to accommodate various shooting scenarios. For indoor shooting conditions, a DC power supply is recommended. For greater mobility and convenience, NP-F batteries and USB-C chargers can be used, making it perfect for run-and-gun tasks.


  • Adaptive Frequency Hopping
  • Seamless Channel Switching
  • Canbe powered by NP-F-Series, Batteries, a DC power Supply, or a USB-C Chargers

What’s In the Box

  • 1x Transmitter
  • 1x Receiver
  • 4x Soft Antenna
  • 2x Mushroom Antenna
  • 1x Cold Shoe
  • 1x Magic Arm
  • 1x USB-C Converter
  • 1x Power Adapter
  • 1x Expansion Accessory


InterfaceAntenna Interface (RP-SMA Male)
HDMI Input (Type A Female)
SDI Input
SDI Loopout
DC Input
Antenna Interface (RP-SMA Male)
HDMI Output (Type A Female)
SDI Output *2
DC Input
Power SupplyDC Power Input: 6–16V
USB-C Power Supply: 5V/2
Battery Power Supply: 6-16V
DC Power Input: 6–16V
USB-C Power Supply: 5V/2
Battery Power Supply: 6-16V
Power Consumption<9W<9W
Net. Weight214g (Exterior Antenna Excluded)210g (Exterior Antenna Excluded)
Input/Output Video Format


1080p60/59.94/50 (Level A)
1080p60/59.94/50 (Level B)


1080p60/50 (Level A)

TX PowerMaximum 22dBmN/A
RX SensitivityN/A–80dBm
Transmission Latency0.04s0.04s

Delivery & Returns

UK Delivery Rates

Free UK Standard delivery on orders over £150.00*

Order Date (if received before 3pm) Cost Latest Expected Delivery Date
UK Standard Delivery (Orders over £150*)  FREE 2-4 Days
UK Standard Delivery £3.99 2-4 Days
UK Express Delivery £5.99 1-3 Days
UK Next Working Day £8.00 Next Working Day
UK Next Working Day (Guaranteed) £15 Next Working Day
UK Before 2pm Next Working Day £18.00 Before 2pm Next Working Day
UK Saturday Delivery £30.00 Saturday
UK Sunday Delivery £30.00 Sunday

View a full breakdown


EssentialPhoto is committed to the provision of quality and reliable products and outstanding customer service. Buyers are entitled to cancel the order and return the goods within 28 working days for a full refund of the purchase price of the goods.

Read our full Returns Policy

International Delivery Rates

We are able to ship from our UK based warehouses to many countries around the world. Click below to check shipping rates to your country.

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Additional Shipping Fees

Please Note, a number of our products fall into 'Large', 'Extra Large' or 'Oversized' products, and would require an additional shipping fee applied automatically to the order. All of these products will display this on their dedicated listings, and further information regarding these fees can be found below.

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International Delivery Rates

We are able to ship from our UK based warehouses to many countries around the world. Click below to check shipping rates to your country...

Price-Match Guarantee

Our new price match policy guarantees you the same price as other retailers so you’re alway getting the best deal possible...

How to make a claim

  1. Send us a link for verification
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  2. Recieve a discount
    If we confirm & verify a legitimate product is cheaper elsewhere we’ll provide you with a dicount code for the difference that you can use at checkout.

Terms & Conditons

The comparison needs to meet the following:

  1. We will match our competitor’s current store or website price - this will apply to a UK based company only, the stock location must be based in the UK (no grey imports).
  2. The competitor’s item must be brand new, identical to ours, and offered on the same terms.
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  4. We must be able to verify the competitor’s price and stock position.
  5. We will only match the price of an item - this does not include delivery charges

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Our ‘Try Before You Buy’ scheme is available at a growing number of participating photography studios around the country. Availability of PiXAPRO products, opening times, and cost of studio hire are studio dependent.

Looking To Hire?

Not ready to make a long term commitment just yet? or just need extra equipment for a specific job? Well we've got you covered. Many of our Products are available for short term rental on our dedicated hire site.
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