The Yocan Verve Kit features a lightweight aluminum body that provides discreet, dependable and durable vaping on the go for 510 thread cartridges. No buttons, all inhale activated! With 3 adjustable voltage levels, users can effortlessly switch between 2.6V, 3.2V, and 3.8V by simply inhaling 3 times within 2 seconds. Pre-heat function, just inhale twice. 510 thread fits up to 2g carts and charges via USB type-c charger.