LBS location mode: If kids wear this GPS smart watch,parents can check the positions of kids anywhere anytime on mobile APP,like kids study at school or play outside.the positioning is more accurate, and the child can connect to the phone with just a click of the SOS. Note: When the child is indoors or where the GPS signal is poor, the positioning error is 0.5 to 4 miles.SOS function: When the child is in danger, you can press the SOS button to call for help, and automatically dial the preset number until you receive a call. You can also set the SOS number and send voice text messages to the kids conveniently through the APP. Great for kids in emergencies.Two-way talk and contact: Parents can have phone calls and voice chats with your kids. The smartwatch can also receive 10 phone numbers on the app, which are then synced to the smartwatch. Turn off the watch and insert the SIM card into the kids smart watch, only compatible with US 2G network GSM SIM card We recommend SpeedTalk or T-mobile.Class Modo, Do Not Disturb: Parents don't need to worry about whether their children's smartwatches will disturb them when they are at school or in class. Parents can set 3 time periods in "Do Not Disturb" mode This feature will disable all functions like calls, math games, camera except SOS emergency. Allow your child to concentrate on class and avoid playing with the watch in class.