Based on GSM/GPRS and GPS you can locate and monitor any remote targets by SMS or GPRS - Get target's latitude and longitude by SMS or GPRS and check position by Google earth - Auto Report position - Send the last location if it enters into the blind area - SOS button send out exact location for immediate rescue/action - Geo-fencing to restrict movement to a defined radius - Send an alert of movement to the user when it begins to move - Send an overspend alert to the user when the target moves exceed of the restricted speed - Send a low battery alert to the user if the battery is low - Network GSM/GPRS Band: 850/900/1800/1900Mhz - GPS chipset SIRF Atlas V chipset - GPS sensitivity: -159dBm - GPS accuracy: 5 m - Powered by rechargeable 850 mAh battery (2x batteries included) - Battery Life: About 48 hours - Package includes: - 1 x Tracker - 2 x Batteries - 1 x AC 110~240V battery charger (US plug) - 1 x Belt - 1 x English user manual