GPS + GSM + GPRS wireless networkBuilt-in high sensitive GPS chipsetBuilt-in GSM & GPS antennaReal-time trackingStart working automatically after electrifyingBuilt-in monitor circuits to avoid breakdown Built-in ON / OFF power, wide voltage input rangeBuilt-in acceleration sensor for saving power intelligently and Resisting static driftingInstalling method: covert / openThree LED indicators: GPS - Blue; GSM - Green; Power - RedCheck location via platform service