I have a several tried several emails to the company about the Barclay Collar. I purchased the more expensive one and when I received it I had just lost my job and put my horse in pasture. 8 months later I got a job and brought back my horse. So I started to use my extremely expensive Barclay collar and it didn't work. (I should of tried it when I first got it but was stupid and never did.) Anyway spoke with Rick ( who is difficult to understand as he is a bit harsh) and he kept telling me how to use it. Well I said ok I will give it another try. Well the collar worked very poorly for two days. The shock effect was hardly none. No effect at all. I emailed to ask for help, no response. I am very sorry that they have a great concept but the product is a piece of *** Don't buy one.