Dial out to up to three family numbers by a long press on the key assigned to the desired number. Receive calls from 8 telephone numbers according to the number priority configured in the smart phone. Kid monitor enables 2-way voice call from / to smartphone. Bi-directional real-time voice messages can be exchanged between ST-01 and smart phone, emulating a walkie-talkie. These messages only consumes data volume. Thus no voice charges. In case of emergency, by pressing the SOS key, the ST-OI will first send an alarm SMS to the three pre-stored family numbers and then automatically will poll the three family numbers from number 1 to number 3 one by one until the call. is attended. The tracking location system is formed by ST-01, satellite (GPS), server and the smart phone. The ST-01 gets location data from the satellite and triangulates its own position, then proceeds to send it to the server which stores the data and send the position per request to the authorized smart phone. GSM locating through SMS sending is supported. Configurable auto-location update period. Accurate balanced and power saving modes. Configurable safety area delimitation via smart phone alarm notification emitted m case the ST-OI goes outside the safety area. Bright colored plastic and metal case with hypoallergenic non-toxic silicone wristband. Designed in Germany. If the collision detector is enabled, an alarm will be received by the smart phone in case the ST-01 detects a shock. If the wear-off detector is enabled, an alarm will be received by the smart phone in case the ST-OI has been removed from wrist for more than 3 seconds. Separation sensor via Bluetooth. An alarm is emitted m case of more than 15 meters separation between ST-01 and the smart phone. Low battery alarm. Pedometer function.