https://www.tractorsupply.com/tsc/product/petsafe-900-yard-remote-trainer
PetSafe 900 yd. Remote Training Collar, Longest Range Option for Training Off Leash Dogs,...
Created for people who go far with their dogs, the 900 Yard Remote Trainer is our longest-reaching trainer. The 900 yard range (that's basically a half mile)...
remote training collar
https://www.shopping.com/item.html?offer=true&id=v1-195300726749-495045663779&provider=0
3000 FT Dog Training US Collar Rechargeable Remote Shock PET Waterproof Trainer - Shopping.com
Only put the collar on when training for exercises. Avoid connecting this collar to a retraction leash. If you see any signs of rash or sores discontinue using...