The Vapir NO2 Vaporizer features several new components that you are sure to find useful. One of those features is an Internal Lithium-Ion Re-Chargeable Battery that allows for fully cordless usage on-the-go. As well as the ability to charge the battery internally while the NO2 is in usage; or Externally with the optional wall charger. Another key feature is the Temperature Memory Re-Call. It Remembers the last temperature you used and allows you to instantly re-call that setting.