Hollyland COSMO C2 2 Transmitters/1 Receiver Kit

Hollyland COSMO C2 2 Transmitters/1 Receiver Kit – Dual-TX to Single-RX for Multi-Camera Live Production

Seamless multi-camera wireless workflow

The Hollyland COSMO C2 2TX & 1RX kit lets two camera feeds transmit to a single receiver. As a result, you remove cabling clutter and reduce setup time on live events, electronic field production (EFP), and multi-camera broadcasts. The dual-transmitter configuration keeps camera feeds synchronized and helps you manage live switching without time-consuming wiring between cameras and the switcher.

Wireless transmission performance and reliability

The COSMO C2 delivers long-range and stable wireless video transmission for professional applications. It operates up to 1,000 meters line-of-sight, with a back-to-back transmission distance of over 300 meters. Moreover, the system features ultra-low latency down to 33 milliseconds, which improves audio-video synchronization and suits applications that need tight timing, such as LED screens and live productions.

Additionally, HEVO 2.0 technology enhances reliability. It automatically detects RF interference and switches to a clean channel, minimizing stuttering, dropped frames, and signal loss in crowded wireless environments.

Professional-grade video and audio capabilities

• Full HD transmission: Supports 1080p60, 1080p50, 1080p30 and other frame rates with zero image degradation.
• Frame rate compensation algorithm: Smooths low frame rate inputs up to 60P to preserve fluid motion in fast-paced scenes.
• Lossless audio transmission: Provides embedded 2-channel 48kHz 24-bit audio for high-fidelity sound that meets broadcast and post-production workflows.

Versatile connectivity and seamless integration

The COSMO C2 supports both HDMI and SDI interfaces to work with a wide range of cameras, monitors, and switchers. You can use it directly with professional gear without extra converters or complex signal routing.

• Transmitter (TX) I/O: HDMI input, SDI input, SDI loopout.
• Receiver (RX) I/O: HDMI output, dual SDI outputs.
• Plug-and-play streaming:
  • NDI support for LAN-based streaming without additional converters.
  • UVC support via USB-C for direct computer streaming—no capture card needed.
  • RTMP output for instant cloud-based streaming without an external encoder.

Built for field and studio productions

The system combines a compact, rugged metal chassis with flexible power options to fit both field and studio workflows. It tolerates demanding production use while remaining lightweight enough for camera-mounted setups.

• Rugged design: Durable metal chassis built for production environments.
• Power options:
  • Transmitters: Support DC power and NP-F batteries.
  • Receiver: Compatible with DC power and V-Mount batteries.
• Intelligent power management: Ensures sustained operation throughout extended shooting sessions.

What’s in the box?

• 2× Cosmo C2 TX (Transmitters)
• 1× Cosmo C2 RX (Receiver)
• 2× NP-F Battery Plates for TX
• 1× V-Mount Battery Plate for RX
• 3× Antenna Sets
• 1× DC Power Adapter
• 1× USB-C to USB-C Cable
• Mounting Accessories
• Carrying Case

Technical specifications

Smart FAQ

Question: Can the COSMO C2 handle two camera feeds simultaneously?
Answer: Yes. The kit includes two transmitters and one receiver so two camera feeds can transmit to a single receiver for synchronized multi-camera workflows.

Question: What streaming options are available if I want to go live?
Answer: You can stream over the LAN using NDI, connect to a computer via UVC over USB-C without a capture card, or output RTMP directly for cloud streaming.

Question: How reliable is the wireless signal in busy RF environments?
Answer: The HEVO 2.0 technology detects interference and automatically switches to a clean channel to reduce stuttering, dropped frames, and signal loss in congested wireless conditions.

Question: What power sources do the units accept on set?
Answer: Transmitters support DC power and NP-F batteries, while the receiver supports DC power and V-Mount batteries, giving you flexible powering options for field and studio use.

Question: Is latency low enough for live productions and LED walls?
Answer: Yes. The COSMO C2 offers latency down to 33 milliseconds, which improves audio-video sync compared to conventional 60ms setups and helps in timing-sensitive productions.