Fangrui Product Details 1. Bm6 Car Battery Electricity Testing Instrument Locator 2. Receive Battery Status Notification Within Bluetooth Range 3. Automatically Checks Vehicle Cranking System When Engine Is Started 4. Checks Charging System (alternator) Lists Time Per Drive And Alerts Cell Phone When Abnormal Data Is Detected 5. Short Circuit And Reverse Connection Protection 6. Automatic Synchronization Within Bluetooth Range, If Not, Data Is Stored In The Battery Monitor For Up To 35 Days 7. Compatible With All 12v Car Batteries 8. Graphical Display Of Historical Data 9. Automatic Engine Start Detection 10. Supports Multi-battery Management 11. Car Positioning Function Through Google Maps 12. Travel Records Including Maps And Routes 13. Wireless (bluetooth 4.0): 10 Meters 14. Parameters: 15. Bluetooth Version: 4.2 16. Bluetooth Name:bm6 17. Input Voltage:dc 6v-20v 18. Voltage Accuracy (9v-16v): +-0.03v 19. Operating Temperature: 40-90 Degrees Celsius (-40-194 Degrees Fahrenheit) 20. Average Operating Current:1.5ma 21. Reverse Connection Protection: Built-in 22. Short Circuit Protection: Built-in 23. Waterproof: Ip67 24. Overall Dimensions: 55 X 41 X 12.5mm 25. Currently Supported Languages: English, Russian, German And Chinese 26. Notes On Using The Bm6: 27. Install The Device Correctly (blinking Blue) 28. Open The App And Allow Permissions 29. Click Add Device, Wait For A Few Seconds, The Attached Device Will Be Searched Automatically (or Manually Enter The Serial Number Pasted On The Back Of The Product) 30. Select The Device, Click Next, Wait A Few Seconds, It Will Automatically Connect To Bluetooth (the Whole Process Does Not Require A Bluetooth Connection Password) 31. If The Connection Is Successful, You Can Use The Product Normally (if The Bluetooth Connection Fails, Please Turn Off Bluetooth And Open The App) 32. If The Above Problems Can Not Be Solved, Please Select The Online Customer Service On The App, We Will Have A Customer Service For You To Answer Que