Rechargable 330YD Remote Dog Training Shock Collar for 2 Dogs

Even in the woods the given range of these collars is accurate. Less then a week of wearing these collars my 2 yr old lab's obediences has improved 100%. I was hesitant to use the zap to correct them but it only took once. The beep and vibrate work just as well after. And yeah, they love to swim. No doubt the collar is waterproof.