The Crystal 2 has several improvements on the Crystal 1's design. To start, the battery is larger on the Crystal 2 (1200mAh battery compared to the 900mAh battery). The Crystal 2 atomizer has major improvements to the method of airflow through the atomizer, sporting a much more restricted airflow that is adjustable for your preferred vapor and heat production. The mouthpiece has seen additional improvements, with a wider base for easier removal and installation. Lastly, the Crystal 2 comes with a warranty on all parts of the device: The battery, the atomizer and the mouthpiece.