●goTele uses GPS and long range radio technology so you can communicate in the most remote places. ●Our app is the perfect pairing with your goTele device! It functions perfectly without a sim card, data, or WiFi by using wireless ad-hoc technology, allowing you to take advantage of all of goTele's features without cell service. With our app you can track your team members in real-time, share your location, receive SOS signals, create geo fences, and more. ●GPS will use the APP positioning service, switch to the background when running, will still maintain the GPS connection, compared to other operations will consume more power