Having used bumper boys for a number of years and as everyone knows, not being able to get service. I keep checking via the web to see if someone has taken over. I finally found someone with a similar product, Seems pricey but Ive had mine going on 20 years.
I found a product out of the UK, cannot post links as of yet. Sporting Saint GunDog Training equipment
I have been trying to start a dialogue with them and still waiting on a response.
Also am curious if anyone has tried one of these unit. The electronics appear to be simplified and straight forward when compared to the bumper boy.