Sorry for the delay here- I accidentally replied from the wrong account... Diane- I am reading online so don't have individual email addresses to write off list. If you are in the USA the single button model is a lot cheaper and still does the same things. The double button model is a lot more expensive I got mine here: http://www.senderogroup.com/ this website gives the link on APH for the two button model. It came really quickly for me from Sendero. I don't know how it happened but I lost my scanned instructions- GRRRRR but I pretty much know what I needed so will redo them later... Sandy- I will try and remember to update the list when I begin to use it in conjunction with Thane. Right now I wanted it to reduce how much I have to move the cane with this bad arm and also for the deaf issues with traffic and aspects in stores. I can see it being effective for times when he is distracted which happens in green teams as I am sure you are aware. I never worked another breed but I suspect the herding guides take longer to work free of the distractibility. I don't want to discourage his interests too much in the world around him since I also am training him as a hearing dog. Its a balancing act, but I did it with Met so I am sure we can do it again. It will not recognize drop offs but Thane already is finding curbs pretty well and discovered I could not get up on a curb he climbed up so he climbed down to walk in the street with me. Its different when your blind in a wheelchair training your dog. Ambulatory people can put the cane in one hand and the dog in the other- I think this is one aspect that is slowing down our work in leash training honestly but we will get there (no advice needed- just figuring out what works and what does not Smile) Right now though I won't even try to use it with Thane as trying to negotiate the wheelchair control, cane and Thane.... Enough already Smile Karyn and Thane