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The JM-VL04 is a professional 4G OBD vehicle tracker that offers advanced features and easy installation. With its built-in accelerometer, gyroscope, and special algorithm, the JM-VL04 can detect improper driving behaviors and accurately calculate mileages. It also has the ability to prevent dark spots in areas with poor GNSS signals, ensuring constant tracking even in challenging environments. One of the standout features of the JM-VL04 is its support for different 4G communication modules, allowing it to cover almost all global LTE frequency bands. This means that the device can receive and transmit data in the coverage of 4G, 3G, and 2G networks, ensuring reliable and uninterrupted communication. Another innovative feature of the JM-VL04 is the voice alarm. When the device detects dangerous driving behaviors, it can sound a human voice alarm to remind drivers to drive safely. This adds an extra layer of safety and helps to promote responsible driving habits. Additionally, the JM-VL04 supports remote listen-in functionality, thanks to its embedded microphone. This allows for discreet audio monitoring of the environment around the device, providing valuable insights and enhancing security. The JM-VL04 is compatible with a wide range of vehicles, thanks to its 9-36V operating voltage. It also supports BLE4.0, enabling Bluetooth connectivity for parameter configuration, software upgrades, and debugging. With its advanced features and reliable performance, the JM-VL04 is an excellent choice for fleet management, vehicle tracking, and driver behavior analysis.