The Authentic Uwell CALIBURN A3S is easy to operate. Built-in 520mAh Battery, hold 2ml capacity with the side filling system, without any button designed, the device is draw-activated, which is very friendly to vape beginners who pursue simplicity. With laser pattern finely printed on the smooth aluminum alloy device, it looks sleek and exquisite. During vaping, the logo-shape animated light matrix will flash. In your video, you can stress the simple and elegant design of the device.