With added OLD display, this smart GPS dog collar is equipped with advanced smart scene recognition algorithm, which is able to automatically adjust the mode according to different usage environments to avoid false triggering. It supports setting the center point and virtual boundary with built-in memory function, no need to reset every time. Equipped with three training modes: sound, vibration and electric shock, as well as long battery made to last longer than normal. Even in the case of no GPS signal, the device will automatically stop working to prevent pets from accidental injury. Suitable for dogs of all sizes, it is a safe, smart and convenient pet training assistant