Description:It is particularly useful if your vehicle, pets, child or your belongings have been stolen. Suitable for caravans, boats, motor homes, trucks, vans and construction machinery and many more.Power on: open the back cover, put the SIM card into the seats, then it is automatically power on. When booting, indicator will light for 10 seconds, after the indicator is off, cover the back cover then it can be used.Main Function: GPS/GSM dual position,Real-time tracking,Voice surveillance, SOS, Auto Track,support location triggered by authorized cell phone, Movement alert, Overspeed alert.SOS Emergency call: Edit the content of messages capital letters"SOS"to alarm, directly press the key SOS above three seconds after the success of seting, the alarm will directly call the seting number. And the indicator will flash.Sound control dialing: use mobile phones or fixed-line to get through SIM card number in the alarm, hang up the machine when hearing the sound of the machine about 3 seconds, and that means it sets up successfully. When there is a sound above 45 db within 10 miters around the alarm, the call will be automatically make call number which you set before. Specification:Material: plastic.Size: 4.3*3.2*1.2cm.Color: show as pictures.GSM Frequency: 850/900/1800/1900 MHz.Charger Input: AC110-220V 50/60 Hz.Charger Output: DC5V 500mA.Battery: Rechargeable battery 3.7V 500mA Li-ion battery.Storage Temperature: -40 to 80 degrees.Working Temperature: -20 to 55 degrees.Accuracy of positioning: 100M-1000M.Hunidity: 5%-95% non-condensing.Note:There might be a bit color distortions due to different computer resolutions.There might be a slight error due to different hand measurement.Package included:1 * A8 Mini GSM/GPRS Tracker.1 * USB Cable.1 * User Manual.