美国采购需求：狗狗训练项圈、无线狗围栏、防吠项圈、GPS追踪器、驱狗器、防吠项圈

I'm looking to clarify something regarding the functionality of your dog collars. Specifically, I'm interested in understanding whether the collars continue to alert (beep) when the dogs leave the designated perimeter for extended periods. Additionally, it would be helpful to know if there's a time limit for how long the collar will react in this manner before it stops or resets. Any detailed information on this feature would be greatly appreciated, as it'll help me make an informed decision. Thanks!