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Hollyland Cosmo C1 transmitter and receiver set with OLED screens, SDI and HDMI ports, L-series battery plates, USB-C power

Hollyland

Hollyland Cosmo C1 SDI/HDMI Wireless Surveillance System

SKU CH-CQ22-EZB0A

Transmits 1080p60 video up to 1000 feet with 40 ms latency and AES-128 encryption over 5.1 to 5.9 GHz, featuring SDI/HDMI I/O and L-series battery power

  • TypePortable Covert Surveillance System
  • Wireless 1080p60 video up to 1000 feet line-of-sight
  • Low 40 ms latency with AES-128 encrypted transmission
  • Transmitter HDMI and SDI inputs with SDI loop-through output
  • Receiver dual SDI and HDMI outputs plus USB-C streaming
  • Powered by L-series battery plates on both units

Portable Covert Surveillance Kit

The Hollyland Cosmo C1 is a wireless video transmission system built for portable covert surveillance. It includes a transmitter and a receiver that communicate over the 5.1 to 5.9 GHz frequency range. The system delivers 1080p60 video up to 1000 feet line-of-sight with 40 ms latency using HEVC/H.265 encoding and AES-128 encryption.

Studio and Field Production Teams

This kit suits camera operators and directors who need flexible monitoring without cable runs in studio or field environments. The transmitter provides HDMI and SDI inputs with an SDI loop-through, while the receiver offers two SDI outputs and one HDMI output for multiple displays. It also supports UVC streaming via USB Type-C for internet-connected computers. Buyers who require multi-receiver distribution or transmission beyond the stated line-of-sight distance should consider alternative solutions.

1000-Foot Line-of-Sight Range

The single specification that determines suitability is the 1000-foot line-of-sight transmission distance. This range supports typical on-set monitoring and field production workflows where the receiver remains within clear view of the transmitter. Obstructions, interference, or greater distance requirements will reduce reliable performance.

Highlights

  • Wireless 1080p60 video up to 1000 feet line-of-sight
  • Low 40 ms latency with AES-128 encrypted transmission
  • Transmitter HDMI and SDI inputs with SDI loop-through output
  • Receiver dual SDI and HDMI outputs plus USB-C streaming
  • Powered by L-series battery plates on both units

Specifications

TypePortable Covert Surveillance System

Questions about this item

How do I power the transmitter and receiver, and what is the common mistake?

Both units accept L-series battery plates or USB Type-C power; the step often missed is inserting a charged L-series battery or connecting a USB-C PD source before pairing the link.

What maintenance will the Cosmo C1 need over time?

Keep the OLED screens and antenna connectors clean, check battery contacts for corrosion, and apply any firmware updates Hollyland releases for the 5.1–5.9 GHz radio module.

What limit appears first during a long shoot with the 1080p60 stream?

The 40 ms latency is fixed, so battery runtime on the L-series plates becomes the first practical constraint during sustained use.

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