What kind of products can tell people's whereabouts?

My friend gave me an "at a glance" satellite locator, which I think is ok. This is to save money and there is no need to pay operating expenses. You can send text messages for free. It is very convenient to bind the mobile phone to the mobile phone card! I need to know where grandpa is now, just send a message. Gee, I don't know what to say. I will call you according to the product description! On that day, the instrument was equipped with a miniature positioning product integrating GPS, GSM and GIS, which is essentially different from many GPS positioning products on the market. It embeds GIS technology, so it is completely independent of geographic information service operators and does not need to pay monthly fees. After purchase, users can use it at any time, completely getting rid of the drawback of "you have to pay monthly if you don't use it". Users buy products just like buying an ordinary mobile phone. "What size they want to use or when" is entirely up to them.

This product is mainly used for the elderly, field workers, overseas business personnel and users who need to track or ask for location information, and has strong practical value.

Children's mobile phone can query the location function of parents who go out (just hang up immediately after dialing), and the product will automatically receive specific location information such as "XX meters around XX building on XX road or XX meters around the intersection of XX road and XX road".

Children's mobile phones set up multiple "monitoring points" for parents to realize the function of wireless positioning SMS notification (children set it through SMS).

Children "shout" the "safety device" on their elderly parents and monitor the sound of the surrounding environment, grasp the environment around their parents and care about their lives.

Parents call for help from their children in an emergency.

Children can start the real-time tracking function when they think that their elderly parents can't find their way home when they go out, or need to be tracked under special circumstances.

If the child's mobile phone gets the latitude and longitude data of the parents who are not at home, it can report to 1 10.