The UNI Twist can be adjusted to fit a variety of cart sizes. Its single button interface allows you to power the device on and off and start the heating element. Toggle through the 6 temperatures (between 1.8-4.2V) by twisting the bottom of the device. The Zinc Alloy exterior keeps it lightweight but long lasting. The USB-C charges 20x faster than a basic USB and it can be charged upright to prevent leaks. The UNI Twist also has a hanging hole so you can wear it around your neck.