TGS PRO 720. This system comes in the original case but with 16 receivers instead of 10 and one transmitter and 16 headsets (original system didn't come with headsets) and one professional lightweight headset microphone. This is a wireless portable FM listening system with PPA T36 transmitter and PPA R35 receivers. It is the top of the line multi-channel system so you can look for a channel with the best reception in the environment you're in - factory or whatever - and the receivers will follow. You can also accommodate more than 16 units on different transmitters because of the multi-channel features.    Very clean and professional well-engineered system was used 3-4 times. Original case in great condition with minor scrape but no dings. Williams Sound is the top of the line Tour Guide equipment and the total system ran over $5,000 with all of the headsets, etc.   Think about why you would purchase new. These are top of the line well-engineered systems and components that last forever.   Transmitter and receivers have been tested and work fine.   You will have to replace the foam ear pads as those don't last due to aging and use. People like new ear pads for tours so get a bag full - they're not expensive. No charger (we used regular AA batteries) and no warranty.   No reserve.