SMOK Trinity Alpha Kit, the new open pod system by SMOK takes square shape with colorful resin streaks on both sides. 1000mAh built-in battery and 2ml capacity cartridge. There is a innovative filling cap on the top. You can just push the cap aside and then add your e-juice through the slot. Quickly to fill and no worry about leakage. 3 modes options - soft / norm / hard, there's an independent button for mode changing. When changing the coil, push the lock button first and pull the pod out. Then you should pull out the coil head and replace with a new one.