The PCKT Two vapor unit offers a built-in ultra-high capacity 660mah Li-ion battery. With 5 practical power modes to suit your hardware needs and pass-through charging, you have that extra battery power when you need it most. 5-clicks on/off feature allows for absolute function and safety when not in use. Unique magnetic adapters make any 510 cartridges ready in a snap. Works with cartridges 11.5 mm in diameter or smaller and works with top and bottom airflow cartridges. In line with the PCKT VRTCL the PCKT 2 has lightning fast charging using a USB-C Charging port and cable. The PCKT 2 also comes with 5 levels of haptic feedback and LED brightness. Cartridge Compatibility : PCKT Two works with a wide variety of cartridges. If you have specific questions about cartridge compatibility please contact us.