bark collar

Hi! I’m Andrew and I’m writing to ask about the use of bark collars, I’ve got a year German Shepherd dog called Ringo .  The problem is he usually keeps barking a lot when he hears noises or footsteps in front of the main door or through the other side of the walls ,,,wow!,,They really drive him crazy and there is no way to make him stop barking,,Although I currently live in a large enough flat  I’ve been given some complaints about this by some neighbours . I have no idea about what can I do. I have tried to change his behaviour telling him off,,but it’s impossible!  My question is the following, ARe bark collar painful or just upset to dogs? Do they give good results?  I hope your replies,,I really worried about Ringo.Kind Regards.Andrew