Report "AT831b doesnt work. I've had it for years and pulled it out only to find there was nobody home. It did not have a battery in it. There deos not seem to be any visible damage to the unit. I looked at a current new one and noticed that the metal clip that makes contact with the positive end of the battery on the new unit its slightly different than the one on my mic. Any ideas on how to get this pup to bark?"