NIB 1970's vintage Motorola TMN-1004B is what I use for my BC-375-E and TCS-8. Wired it to a standard mic plug. Direct plug and play. Here's one - http://www.ebay.com/itm/Motorola-TMN1004B-Base-Station-Microphone-/141611251383 Doesn't "look authentic" but works like a champ when you want to be heard. 73 DE JIM K6FWT