【INNOVATIVE POSITIONING TECHNOLOGY】 Our WIEZ GPS wireless dog fence system ONLY have a COLLAR RECEIVER, it use a GPS location technique, so it's more stable, and accurate than other traditional wireless fences that use a radio-frequency technique. A total of 12 high-quality satellites support the work, so we can provide a much better accuracy than other similar products. 【ADJUSTABLE DISTANCE & WARNING STRENGTH】 This GPS wireless dog fence can cover areas up to 3281 feet radius and up to a max of 776 acres allowing you to use it for OUTDOORS. Its control distance is adjustable between 98-3281ft. The vibration intensity and electric shock can be adjusted in three levels. Set it up once, and the latest model has a full Memory Function. You won't face any INTERFERENCE issues! 【SAFETY DESIGN】It conforms to UL 62368-1 and certified to CSA 62368-1.If your dog goes beyond the set range, the vibration or electric shock will keep working non-stop for 16 seconds, followed by a 30-second pause. Then it will repeat this three times automatically. After warning three times, if your dog has still not returned to the safety area, the system will no longer work until dog comes back to the safety area. All in all, the humanized software settings can avoid any harm to your pets.