Compatibility: URSA Nano, URSA Nano 2, URSA Nano S, URSA Pro, URSA Pro 2, URSA Baby Pro. All you do is take your pod out of the device and remove the rubber plug to top up with your desired juice. For a discreet vape and a tighter MTL draw, try the 1.0 or 1.2 Ohm pod.