Brand NEW WIEZ GPS Wireless Dog Fence for Most of Dogs WIEZ wireless dog fence uses GPS positioning technology, which is ONLY for OUTDOOR USE! A long press the power key "P" to turn on the device. Choose a center point and wait about 1-3 minutes until the number of the satellites reaches six or more, the device works normally. A long press(about 3 seconds) of the mode key ?M? to enter the distance setting mode, and the sign "02"(it means 20 meters) will flicker. According to the actual situation, you can use the up and down keys to adjust the distance required. Five seconds after you set the distance, the system will automatically remember the set distance and return. A short press of the mode key "M" to set the alarm mode beyond the control area. There are three alarm modes, beep, vibration and shock. You can also use the up and down key to adjust the strength of the alarm. After you have chosen the pattern that works best for your dog, it is time to begin training. See pictures for more item details. Trusted Seller-Fast Ship!