This tracker GPS103A is a new product based on the GSM / GPRS network and GPS satellite positioning system. It provides multiple functions, such as security, positioning, surveillance, emergency alarms and so on.Features:GPS/GSM station positioning.SMS/GPRS/internet network data transfer.Point-to-point, point to group, group-to-group monitoring.Continuously auto track upon different time and distance intervals.Absolute street address with GSM network.SD card for data logging.Can be installed on Bus, taxi, truck, car, etc.Maximum 5 cell phone numbers are allowed to admin the tracker.Other functions: SOS, Geo-fence, movement alarm, over speed alarm, accident alarm, voice monitoring etc.Cut off the oil and power system.The on-line web page tracking software has one month free trial, afterwards cost about 10USD per year.Optional accessories:Shock sensor and siren.Note: the optional accessories are not include, to purchase them, please contact the seller.Specifications:Content SpecificationsNetwork GSM/GPRSBand 850/900/1800/1900MhzGSM/GPRS module SIM900BGPS module SIRF3 chipGPS sensitivity -159dBmGPS accuracy 5mGPS start time Cold status 45sWarm status 35sHot status 1sVoltage of car power system 12V ~ 24VBackup battery Rechargeable 3.7V 800mAh Li-ion batteryStorage Temperature -40°c~ 85°cOperation Temperature -20°c ~ 65°cHumidity 5% ~ 95% non-condensingItem size 10.5 * 5.5 * 2.5cm (4.1 * 2.2 * 1.0in)Item weight 105g / 3.7ozPackage size 19 * 13 * 5.8cm (7.5 * 5.1 * 2.3in)Package weight 567g / 1.25Lbs