CALIBURN AK3 stands out with a logo-shaped indicator and curved profile. It still keeps a compact & portable body and an easy auto-drawing.Caliburn KOKO is a draw activated MTL pod vape, with refillable 1.2ohm pods and a 520mAh battery. The original 1.4ohm Caliburn pods are also compatible with the KOKO, and both the 1.2ohm and 1.4ohm pods have a 2ml e-juice capacity.