Specific:
<br />- Initialization, send SMS (begin 123456) to the unit, it replies OK, then you initialize all the settings to default factory settings.
<br />- Change password, send your old and new password (remember to add the word password before your password )separates by a space. 
<br />- Authorization, there are 5 numbers to be allowed to authorize in the tracker at most.
<br />- Single tracking, make a missed call to device number, it will reply a real time tracking message include longitude and latitude.
<br />- Continuous tracking automatically, send specified format message, it will report data at every 10s when the object is moving and every 500s when it is static.
<br />- Data logging, it can log the tracking position and alerts automatically in the SD card.
<br />- Alarms, it sets with low battery alarm, power off alarm, GPS blind spot alarm, SOS alarm, GEO-fence alarm, movement alarm, overspeed alarm, ACC working alarm and vibration alarm.
<br />- It can cut off and resume the oil and power system of your vehicle.
<br />- You can set up arm by the SMS and the remote controller, you can disarm through the same way too.
<br />- It can switch between GPRS and SMS mode, track and monitor mode, and TCP and UDP mode.
<br />- With it, you can check the vehicle state, IMEI, and reset SMS, set time, GPRS, APN, IP and port, and monitor central number.
<br /> 
<br />Type: GPS,Tracker
<br />Model: TK103B
<br />GPS Bands : GSM 850/900/1800/1900MHz
<br />Network : GPRS,GSM
<br />Voltage Range: 12V - 24V
<br />GPS Sensitivity: - 159 dBm
<br />GPS Start Time: Cold status:45s, Warm status:35s, Hot status:1s
<br />GPS Positioning Precision : 5M
<br /> 
<br />Package weight: 0.61 kg
<br />Product size (L x W x H): 7.90 x 5.10 x 2.20 cm / 3.11 x 2.01 x 0.87 inches
<br />Package size (L x W x H): 8.90 x 6.10 x 3.20 cm / 3.5 x 2.4 x 1.26 inches
<br />
<br />Package Contents:
<br />1 x TK103B GPS SMS GPRS Vehicle Tracker, 1 x GPS Antenna, 1 x Microphone, 1 x GSM Antenna, 1 x Wire, 1 x Relay, 1 x Keyless Entry, 1 x Card Slot, 1 x Bilingual User Manual In English and Chinese