I am hoping someone can help me here. My fiance has a Unisonic Dukes of Hazzard Digital watch with metal band. Has the horn go off he says. He had brought up to me that he would love to get it working, but has no battery in it and I thought I would try and find him one for it, but I can't anywhere. Can someone please help me on what one I need to get and where I can get one?