Features: brand new and high quality Avoid losing information when the on-board computer is powered off. A good helper for replacing car batteries. Maintain car computer memory dashboard information, digital clock, audio, memory for seat, ABS, anti-skid system, and electric inspection mirror. Save for time and improve efficiency. Applicable to: all for cars with obd2 sockets after 1996. Model: BT-30. Specifications: Material:ABS Size:As Picture Shown Color:Black and Red Instructions for use and precautions: The red clip plug turns red, the black clip plug turns black, (conversely it will burn the car computer) Insert the car OBD plug after the red light is on Noisy conventional plug connection Be careful to replace the battery Please be careful not to turn on the lights or other devices that use power, and do not let the positive electrode of the battery for touch the metal, otherwise it will burn the fuse of the car OBD socket Loosen the red clip after replacing the battery. If the sound still exists, the replacement is successful. If not, the fuse may have been burnt. Directly connect to the on-board computer through OBD diagnosis. The normal battery has a red light. After inserting the on-board OBD plug, it will make a beeping sound. It is powered by a 12V battery. It is absolutely guaranteed that the battery car computer settings will not lose memory. Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Auto Emergency Power Cord