The Atopack Dolphin starter kit comes with 6ml cartridge and 2100mah built-in battery. The Atopack Dolphin cartridge is specially equipped with the newly designed 1.2ohm head to cater to MTL enthusiasts. In addition, the stopper and mouthpiece sleeve can be adopted when needed to reduce the air ventilation, which augments the performance of MTL inhales. You can directly inject the e-liquid into the elliptic injection hole on the side of the cartridge. It is far simple and convenient for you to operate. It evokes the spirit of the real dolphin. The unique irregular shape makes the device distinguished in your hand. The battery mod comes with 2A quick charge system and battery life indication. You can charge it via USB cable.