You can set a pin code on the DC 40's that should stop the interference and I'm sure wh the Alpha they currently are not having as much interference but there's not as many callers out there yet either but I'm sure there's also a way to stop it with the alphas such as a pin

I've had both systems hands down the alpha. Way more features plus you can get there attention when you need to.

Do they make them for lap dogs???? Did you let the grass grow up and you need a collar to find fee fee in the yard?????

You just load up your sheep hounds and we will play, want it b on the deers though. I'm not scared, YOU????

I bet I can make one of these collie dogs run a nanny and prolly hold it til we get there. No I aint scared.