The Proteus is Aspire’s E-hookah. A dual 18650 e-hookah head that is compatible with any hookah vase that is provided. The original Proteus tank is a 10ml capacity tank that is compatible with 0.25ohm coil. The Proteus also has an updated tank that is 18ml with a 0.16ohm coil. Filling the Proteus is extremely easy; place the bottle on the filling hole, press down to start filling the tank.