The ultra-thin 3-meter power cord is easy to store and conceal. It slides easily into the gap under the windshield. For concealed wiring, the cord passes through the gap to the door. Using your hand, lift the door-side weatherstrip, slide the cord underneath, and continue to the fuse box. You can also plug it directly into the cigarette lighter (the latter must be purchased separately). No tools are required, and there is no need to disassemble the dashboard. Installation is completely lossless. There are two connections inside the wire, namely the negative pole of the car power supply (ground) and the ACC power supply of the car key (generally, all can be connected to the fuse box near the steering wheel). Turn on the car power supply and the car clock screen will display the time. When the vehicle is turned off, the display disappears and the power consumption is cut off. The internal clock continues to work normally thanks to the internal industrial-grade rechargeable battery (which does not require replacement for many years). There are 4 display modes in total. Display time only Display temperature only Display voltage only The time, temperature, and voltage are displayed alternately. Once the display mode is set, there is no need to reset it next time, it has a memory function With manual temperature error correction function, the adjustment range is -5 to 5 . Built-in imported ultra-long-life memory battery, the car continues to work after the power is cut off. Extremely small size: length 133 width 26 height 23 mm Note: The data are all manually measured, please allow an error of 1-3 cm. Due to differences in light and display, there may be some color differences, please refer to the actual item received.