This device is controlled by SMS commands sent to your GSM sim card that is fitted in the device, it sends back messages with coordinates of the items and a link to a map showing the location of the tracker. it also allows you to monitor sounds and speeches or any other audio more than 40 decibels encases of intrusion on your vehicle or any other personal property you want to track.the devise is to be used for personal security; only track items and properties you own. This is to prevent abuse,misuse and breach of your country's laws.Rechargeable, strong magnetic adsorption, recordable, anti-lost positioning for elderly childrenMaterial: PlasticModel GF07 memory no memory (M) GPS positioning accuracy 500 (m) Battery type polymer battery life 36h Waterproof function without antenna type GNSS external power supply form built-in power interface text Chinese English type portable Charging input: AC110 - 220V50/60HzCharging output: DC5.0V 300-500mAMachine battery: 3.7V 400mAh Li-ion batteryStandby time: 1.8 daysWorking time 32 hoursExpansion card; mini TF cardContinuous call: 150-180 minutesNetwork standard: GSM/GPRSGPRS: upload60, TCP/IPWorking voltage: 3.4-4.2V DC16 sGSM positioning time: 25 secondsBasic parameters: frequency band GSM 850/900/1800/1900MHZType: GPSBattery Capacity(mAh): 400mAh Working Time: 4 - 6 DayPackage weight: 0.054 kg Product size (L x W x H): 4.20 x 2.00 x 2.50 cm / 1.65 x 0.79 x 0.98 inches