This product uses vaporization elements designed for reaching precise temperatures and delivering a pull quickly and accurately, while consistency is achieved through optimized temperature, airflow and time controls. To use, inhale at a normal, consistent rate, and the vaporizer will shut off automatically after 3 seconds. A slight vibration will occur when 2.25 mg has been released. This pen is available in two sizes: 0.185 g (50 pulls) and 0.5 g (200 pulls).