The GPS dog fence collar features 1-7 warning levels in vibration or static shock modes. It starts at Level 1 when your pet goes beyond the boundary. As long as your pet remains outside, it automatically progresses to the next level. After the 7th level in the first warning cycle, the collar enters a 1-minute protection mode emitting only a “beep” sound. If your pet hasn’t returned to the safe area, the collar begins a second cycle of 6 warning levels. After completing two cycles of warnings, the collar enters protection mode. It emits warning tones until your pet returns to safety or the battery depletes.