The authentic Uwell Caliburn X 20W Pod System, featuring an integrated 850mAh battery, 5~20W output range, and is compatible with both G / G2 Coils. Constructed from durable aluminum alloy, the chassis of the Caliburn X Pod System offers a strong and resilient chassis against light falls and drops. In addition, the refillable pods hold up to 3ml, and utilizes a juice viewing window to ensure a minimum fill level to prevent any dry hits or burning of the coil.