Great training collar!My 11 pounds dog has the terrible habit of barking at the yard when some strangers came by. This is very annoying me so I bought this collar to try to stop him. This collar has 500 yards training range and I am very satisfied with that because I have a big yard. I train my dog only use the dual vibration feature that is enough to guide my dog , after one week using the collar my dog is rarely to bark. Also, I can charge the collar and the remote same time and only use one cord. I feel lucky to buy this collar!