EASY TO SET UP – To start the sim, is micro size, need to have an activated sim card from your mobile carrier. Please make sure the watch is turned off when you insert the SIM. Only support 2G card NON-DISTURB – When kids at school or class, parents don not needs worry about the watch will bother children study. Parents can set 3 period time on Do Not Disturb mode. This functions will forbidden all features like call, game, camera, but except SOS functions. KEEP KIDS SAFE – Equipped with AGPS+LBS. In case of emergency, press the SOS button, it will sent a distress message to the guardian. Up to ten emergency calls can be configured, and pressing the SOS button will automatically dial. When kids are outdoor, Parents can track children’s real-time location. But when Kids are indoor or at poor gps signal place, the positioning will have errors 0.3-5 miles. WATERPROOF – It’s life waterproof, and it is not necessary to remove the watch when it is raining or washing hands. However, please try not to wear a watch for bathing and swimming, which may reduce the life of the watch.