Built with durability and power, the Evolve Plus delivers huge clouds. The Evolve Plus provides 15 seconds of continuous heat and has a built-in stash jar for ultimate portability. The quartz dual atomizer delivers pure flavor, while the functional coil cap prevents concentrates from leaking and keeps the mouthpiece from overheating. The Evolve Plus fits perfectly into a 14 millimeter female downstem to operate as a portable eNail. Features: Portable & Powerful QDC technology (Quartz Dual Coil) Heats up instantly 15 Seconds of continuous heat 1100mAh Battery Capacity Micro USB port Built-in Carb Cap Built-in Silicone Jar Diameter: 19 mm