It has about 30cm long cable and red color cable is positive, and black color cable is negative. The item is lightweight and it is easy to install in cars and other vehicles. made of high quality plastic, it is durable and sturdy. It fits for most cars in size. It is very suitable for most vehicles in most occasions. Item Name: Cigarette Lighter Socket Material:Plastic Input Voltage: 12V-24V Output Voltage: 5V Output Current: 2A Output Power: 10W Size Details: Inner Diameter: 21mm/0.83" (Approx.) Outer Diameter: 27mm/1.06" (Approx.) Inner Depth: 34.4mm/1.35" (Approx.) Height: 6.3cm/2.48" (Approx.) Cable Length: 30cm/11.81" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 X Cigarette Lighter Socket