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.

Kids i-tracker User Agreement, for all Kids GPS Smart watch, Senior GPS healthcare Tracker, Smart fitness bracelet, Personal mini GPS, Pets mini GPS tracker, Automotive Vehicle GPS tracker - Shenzhen Yushengchang Technology Co.,LTD

GPS Bracelet with heart rate and SOS GPS Bracelet with heart rate and SOS GPS Bracelet with heart rate and SOS Senior Healthcare GPS Bracelet with heart rate blood pressure SPO2 monitoring , temperature thermometer sensor, 4G IP67 waterproof Senior Healthcare GPS Bracelet with heart rate .blood pressure monitoring and Temperature measuring All health data (HR/BP/SPO2/Temperature)saved in Beesure GPS app for 30days: Manual measure on device end OR Remote measure in phone app end , both available

OEM Customized Branded App for Oversea clients

GPS Bracelet with heart rate and SOS GPS Bracelet with heart rate and SOS GPS Bracelet with heart rate and SOS

Overseas Clients video for kids GPS watch and senior healthcare