Features: Real-time tracking, show location information automatically. This GPS tracker work based on GPS +LBS+GSM and it has worldwide coverage. This device needs a SIM card to give you unlimited data coverage, which is not included. It is not only a GPS tracker, but also a car alarm. Geo-fence alarm, it will alert you when the wearer has entered or exited defined areas to ensure the safety of your loved ones. Over-speed alarm, you will get alerted if your vehicle exceeds a speed limit set by you. Wide application, suitable for most vehicles. Specifications: Material: plastic Color: as pictures show Working voltage: 12V-24V Operating temp: -20~+55 Tracking sensitivity: -159dBm Location accuracy: 10 meters CEP Package weight: 315g Package size: 14.5 * 10.5 * 7.5cm Package List: 1 * GPS Tracker 1 * GPS Sensor 1 * Relay 1 1 * SOS Cable 1 * Speaker Cable 1 * Power Cable 1 * User Manual