Beyerdynamic MCE 5-4
microphone. With Battery or 48v Phantom Power bomb
Original mercury battery no longer available
Replacement batteries use 5 LR43 /GP186. Button cell in plastic tube to make up battery.
Pack of 10. = £3.00 with plastic tube holder.
Or use 4 MAXELL SR44SW Button cell in plastic tube to make up battery at £1.20 Each
See B7 in Batteries & Chargers - Good luck!