This is a great video pair. Wireless Transmitter and Receiver. 
These are solid little units that perform as well as Teradeks that cost three times as much. 

There are many different ways to power these units, they take L series sony batteries and external power that can be provided from a wall adapter or a D tap or similar battery connector. Also they can be powered via USBC. Generally I'll try to have the receiver powered via AC and have the sony battery the unit as a backup. You will get several hours performance on a 4000mh L series battery. In my experience the transmitters use the battery faster than the receivers. 

Tx and Rx have both HDMI and SDI connectors so you can use the pair as a cross converter also. For example if you have an SDI feed from a camera you can cross convert it using these units to put the feed into an HDMI monitor. 

I have multiple units. Contact me if you want to add more receivers or transmitters. 

You can pair two receivers with one transmitter. 


The auction includes: 
Original Box, Antennas, AC supply, Tx & Rx

Also I'll include these extras: 
Larger more powerful antennas that increase the range and performance. Sony L series battery and charger. HDMI cable, 


About the product:

Add up to 1080p60 wireless video transmission to your gimbal, mirrorless, or DSLR camera rig using the lightweight Mars 400S PRO SDI/HDMI Wireless Video Transmission System from Hollyland. The transmitter provides HDMI and SDI inputs and the receiver offers SDI and HDMI outputs. It features extremely low 0.1s latency with line-of-sight transmission up to 400' to the receiver and up to 300' to the Hollyview Wi-Fi app. For a strong line-of-sight signal, the system includes two external antennas on the transmitter and two on the receiver, and one is included as a spare.

Using the Hollyview app for iOS or Android, you can monitor your video transmission in real time via a Wi-Fi connection as well as live stream directly from the receiver via your computer using a USB Type-C adapter. The app also allows you to install optional channel scanning firmware enabling you to easily find the strongest transmission signals. The transmitter can simultaneously transmit to up to one receiver and two apps, or to a total of four apps without the receiver. The redesigned body makes it a low-profile choice for your rig, and it features multiple fan modes to keep it cool or quiet when you are shooting.

The 400S PRO transmitter and receiver are compact in size, feature a bright OLED display for configuration, and an integrated shoe adapter with a 1/4"-20 mounting thread for different mounting options. Each unit can be powered using a USB Type-C source, the included locking DC power adapter, or by using a separately available L-series type battery using the integrated battery plate.

Key Features
  • Transmits up to 1080p60 SDI or HDMI video
  • 400' line-of-sight transmission to receiver, 300' to App
  • Bright OLED display
  • Real-time app monitoring and live streaming via the HollyView app
  • Simultaneously transmit to one receiver and two apps, or to four apps
  • HDMI and SDI inputs on transmitter and HDMI and SDI outputs on receiver
  • Two antennas on transmitter and two antennas on receiver
  • Power via L-series battery, DC adapter, or USB Type-C input
  • Integrated shoe adapter with 1/4"-20 mounting thread
  • Install optional channel scan firmware via the HollyView app to find the strongest signal