I have an older model garage door opener that was here when I purchased my home in 2001. I'm having trouble finding a remote control replacement for this. I s there any way you can tell me where I can purchase one and also I need to know what kind and size of battery it takes. I found an old remote but I'm not too sure it belongs to this one. I don't have a owners manual remote # 139.53879 date 8/96 fcc id HBW1136