Awesome device, barely used. You can look up the AngelSense website to learn more about it. Safety tracker for kids. Comes with device and charger. You will need to buy the subscription (monthly or yearly) to activate the sim as it uses 4g and has its own number. Kids can call only you, you can track them in real time and call them. Awesome if you have a special needs kiddo and worry about them running off as you can track the device in the app. You can even broadcast a message to your child if they are at school or away from you and are upset, or have the message play at a certain time for example as a medication reminder. Also great for kids who are just too young for a real cell phone but take the bus or walk home.