0.4ohm is only compatible the Xros Pro Kit, Xros Pro 2 Pod Kit, Xros 4 kits and Xros 5 Kits. Compatible with the Xros 2, Xros 3, Xros 3 Mini, Xros 4 Pod Kit, Xros 4 Mini Kit, Xros 5 Kit, Xros Nano Kit, Xros Mini and Xros Pro 2 Kit.
