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When disconnected from the VPU, the receiver collar will beep twice, then shut down. Press and hold the Mode button down until two beeps sound and a green LED comes on. Release the button. The receiver is now on. Take the receiver collar around the boundary and verify that the boundary is working correctly. Leave the receiver collar on the receiver handle while doing this and always move the collar in the direction of the white arrow. Don't move it back and forth like a pendulum. Do not walk or move the receiver collar backwards. Approach a section of the boundary from the pet area and verify that the collar emits the warning tone. This will vary slightly, but should be close to the boundary flag location. One to five feet beyond the boundary flags location, the receiver activates the run through stimulation level.