GPS tracker is feature phone system +GPS module +WIFI module, with SIM card for GPRS communications .It work with phone app is phone to phone , m2m. GPS trackers are designed to bring you greater peace of mind by helping you to monitoring real time your kids, your elderly, your pets, your car/ asset and all your local ones' real googlemap position

​SOS working method is : once user press GPS SOS panic button in emergency situation, the device will auto call SOS bound 3 phone numbers in app in 2 rounds until anyone number pick up;meanwhile send SOS SMS alerts with Googlemap GPS position URL and syncs the SOS notification to server end and app end; GPS get the position from satellites (outdoor) ,or get position from( Indoor)LBS or WIFI , syncs the datas to server , server syncs the datas to phone app ,GPS is mini phone system , work with phone app for voice call , intercom chatting and Video call if firmware support(4G) , this is phone to phone working method, if the sim card in the GPS is available for international roaming, then GPS is ok for global monitoring. All working features in the app. Regarding the emergency call, Please kindly note all our GPS with panic SOS button for emergency call once the user in an emergency situation

Server Configuration Guide, Please kindly referr to our protocol detail and configuration all the necessary features on your server portal ,The most important is the device send whatever Linkkeep, your server need reply or confirm the Linkkeep for maintenance the network connection,the server is TCP/IP socket server , all GPRS communications , NO UDP

Why gps tracker need sim card? --GPS device is a mini Featured phone system , just without the keyboard .GPS device system consist of mini phone system+GPS modue +Wifi modue.GPS device work with smart phone app and Cloud server , all GPRS communications via. Sim card through Operator Cellular 's network. It's available for global real time and real Googlemap tracking if the sim is available for international roaming. GPS work with smart phone app is phone to phone. --Any GPS Tracker has a receiver to triangulate its own position from the satellite signals. All the GPS trackers need a SIM card in order to achieve connectivity. SIM cards are what allow location transmission, sending audio data, and receiving commands to turn on audio and other advanced features.

Seressiter OEM kids GPS tracker watch -Customized GPS kids watch Seressiter for Italy 2858 security Sep.2017 Parents and children like the smart watch! Mom and Dad are calm because Seresitter gives them confidence. The children are happy because they receive a colorful and fun gift! What if they're busy or can't read the notification? No problem! Just press the Sos button to activate the alarm towards the parents. It's a piece of mind for parental control your loved ones.

Italy Mario Team visited us in Aug. 2017