Compatible with both nicotine salt and normal e-liquids. Best suited to someone who smoked 10+ cigarettes a day, who likes a small box style vape device. UWELL CALIBURN KOKO has been designed with FLAVOR in mind. Somehow Uwell cracked the code on how to make their vapes put out an amazing amount of flavor. No other pod vape comes close. You can even replace the coil in the pod to keep your clouds fresh. Just pop the old one out and pop a new one in - its super easy. No buttons, so it's impossible for it to go off in your pocket! This is a great option for vapers who like like to keep their devices in their pockets.