1.General Description
   ES840 is a 4G (Cat.M1&NB) OBDII GPS Tracker for vehicle. ES840 supports CAN Bus and all kinds of Line. It can automatically detect Ignition On/Off status via reading RPM information. ES840 has three modes to locate by GPS+Bluetooth+LBS.
2.Main Functions

• Bluetooth-positioning
• 3-Axis Accelerometer
• A 110 mAh backup battery
• Over speed limit
• Power Saving Mode
• Mileage
• CAN Communication
• Storing Message: store up messages when device disconnect with network
• Geo-fence: show the alert when the device are in or out the range you set
• OTA: configuration ,setting and firmware of device can be remotely upgraded