This is a rechargeable digital clock with an auto backlight. It can be charged via the solar panel on the back or via USB. If the battery runs out, it will operate on a button battery. It has no unsightly power cord, allowing for a clean installation. The backlight can be switched between blue and orange. It automatically turns on when vibration is detected at night and turns off after a while when the vehicle stops. Made in China. We have tested its operation just in case. Please note that the packaging may be damaged. 8cm x 3cm x 3.5cm Weight: 55g