????GSM/GPRS Waterproof GPS Smart Watch Tracker¡¢ Support iOS App / Android App / Wechat /SMS¡¢ Network Band: 850/900/1800/1900MHz(Blue)<br>Features<br>1. GSM quad band network¡¢ global GPS location <br>2. Tracking Via website / iOS App / Android App / Wechat / SMS <br>3. Geo-fence safety alert/trace playback <br>4. Take-off alert <br>5. Click to call <br>6. Two way audio communication <br>7. Activity monitor <br>8. Screen size: 26*20mm <br>9. Low battery alarm <br>10. GPS Positioning accuracy: 10-15m<br><br>Attentions<br>1. Due to external factors all GPS devices have position error¡¢ so the position provide by this device just for reference only. <br>2. There may be delays caused by telecom operators at certain circumstance. Our company does not assume liability for users personal and property safety.<br><br>Prepare for work<br>Please choose GSM network-based Micro-SIM card (same as iPhone 4) for the product. And please note: <br>1. Please be sure the GPRS and Caller id has been activated. <br>2. Please be sure the watch is turn off before insert or take out the Micro-SIM. <br>3. Take out the battery from the device¡¢ put the SIM card in to the SIM holder. <br>4. Put back the battery and install the battery cover. <br>5. Power on the device : press power key until the music and screen on. <br>6. The device only power off via APP command when you set master number. <br>7. Charge the battery: use the charge clip connect