Being the most portable vaporizer, Joyetech CuAIO D22 starter kit comes in a quite small size, much convenient and comfortable to carry and vape. The atomizer is equipped with dual child lock system. It is very safety. The top filling system makes refill more quick. The airflow control was placed on top. Simply rotate the airflow ring clockwise or counter-clockwise to adjust the air-inlet. There are two liquid capacity can be choosed: 3.5ml and 2ml for TPD version. The battery has dual circuit protection and battery display function. You can charge it with a PC or wall adapter via USB cable.