Used Hollyland Mars 300 PRO Enhanced.  Tested working & in good condition.  

Includes 

• Mars 300 PRO RX + TX modules
• 3 antennas 
• HDMI  to HDMI adapter
• HDMI to Mini HDMI adapter
• Carrying case
• Two NPF battery
• 1x Cold Shoe mount

Condition Notes: One of the small display screen covers has a thin surface crack.  This is shown in the 4th picture. The display still works perfectly. 

Product Description:

Thank you for purchasing the MARS 300 Pro Wireless HD Video Transmission System. This product uses the latest image coding and decoding technology and 5G wireless transmission technology to achieve ultra-low latency video transmission. The transmission distance is greater than 650ft in the line-of-sight environment, and the maximum resolution is 1080P60Hz, enabling full HD HDMI video transmission.

Features:

Latest image coding and decoding technology, 5G wireless transmission technology, Ultra-low latency video transmission
Transmission Range 650ft
HDMI IN/HDMI LOOP OUT、Dual HDMI OUT
Both the transmitter and the receiver can mount the battery
Support USB Interface Software Upgrade
Industrial Metal Casing, Stable and Reliable

Application:

Filmmaking
Live Broadcast
Sports Activities
Educational Recording
Wedding Ceremonies
Corporate Events