I have some other vintage electronics/pro audio listed.  I will combine shipping.  

Here is an older NEC AEC-400 Acoustic (phone) echo canceller for a Video Teleconferencing Network system.  Here is some info I found online:  "The Acoustic Echo Canceler models AEC-400 and AEC-700 are described as audio systems which may be used in either terrestrial or satellite transmission media. They both incorporate VLSI circuitry which enables the elimination of feedback echo within a room and a transmission echo caused by telephone system hybrid circuits during voice transmission in a teleconference. The AEC- 400 has balanced microphones with a built-in power supply which allows a simultaneous two-way conversation. The AEC-700 has a 10W main power."  

This powers on and it was working when removed.  The power cord is included.  I WILL ACCEPT A RETURN, BUT THE BUYER PAYS!  I'M CLEARLY STATING I CANNOT TEST THIS FULLY, BUT IT DOES POWER ON.   I'm not sure what type of system it was removed from.  There are some scratches and signs of use on the case, but nothing is broken.  I HAVE 2 OF THESE.  THEY ARE BOTH IN THE SAME CONDITION.   I will combine shipping if you buy both.   Please see pics for more details.   

SHIPPING COULD GET EXPENSIVE.  EACH ONE IS APPROX. 15LBS AND THE BOX WILL BE LARGE.  I'M SORRY, BUT I HAVE NO CONTROL OVER THE RATES. 

******SOME STATES ARE NOW CHARGING SALES TAX ON PURCHASES.  I THINK IT'S BS AND WRONG, BUT EBAY DOES IT AUTOMATICALLY.  I HAVE NO CONTROL OVER IT.   VOTE TO CHANGE THINGS!

*****BE SURE TO CHECK THE SHIPPING TAB!  THE SHIPPING SHOWN MAY NOT BE THE CHEAPEST.  I USUALLY HAVE DIFFERENT CHOICES. 

****** INTERNATIONAL BIDDERS: I USE THE INTERNATIONAL GLOBAL SHIPPING PROGRAM. CLICK ON THE SHIPPING TAB AND SELECT YOUR COUNTRY.  IT SHOULD SHOW YOU THE SHIPPING COSTS.  IF YOUR COUNTRY IS NOT SHOWN, THEN I WILL NOT SHIP THERE!  I DO NOT MAKE THE IMPORT COSTS AND SHIPPING COSTS.  THE EBAY SHIPPING CENTER DOES.  BUYER WILL BE RESPONSIBLE FOR ANY AND ALL IMPORT COSTS. 

RETURNS: I will accept 'free' returns ONLY if the item is not as described.  IF you don't like it, doesn't fit, changed mind, etc, there MAY be a deduction in the refund to repay the return shipping I am charged.   Original shipping is NOT refundable for any reason.  PLEASE understand this, especially if you are buying something that costs a lot of money to ship because you will not get that original shipping refunded and I may deduct return shipping fees (figured on a case by case basis).   Thank you.

**** I RESERVE THE RIGHT TO CHANGE SHIPPING CARRIERS AS LONG AS THE PACKAGE WILL ARRIVE AT THE SAME TIME, OR EARLIER, THAN WHAT THE  BUYER CHOSE.