Just connect directly to cigarette lighter by adapter cable when using and general base size less than 2.75" for most cars. Keep your beverage cool or coffee hot for 10 minutes. Touch screen control, red LED light for HOT mode, heats up to 58°, blue one for COLD mode, coolest at 5°. Pass the ROHS Certificate. And it will be automatic shutdown to protect the car battery when the Voltage is < 10.5 V. Enjoy your cold beverage in summer or hot coffee in winter, whether traveling, working, or outdoors.Warm milk to your baby whenever and wherever.