Halo is, first and foremost, the safest and most advanced virtual fence for your dog. But Halo offers so much more than any other e-collar. Halo Fences keep your dog safely inside the boundaries that you easily define, and prevents them from leaving (unlike other tracking collars, which only track and notify you when they escape). It also keeps track of the activity levels and exercise that result from the freedom the fence provides. Your Halo Collar prevents, protects, tracks, and trains your dog—and can even guide your dog home.