The intelligent indicator will blink 4 times each time to you take a puff and will blink 15 times when voltage is low and needs to be charged. The battery gauge on the device is presented in the form of an intelligent LED indicator which surrounds the only button on the mod, the firing button. The Vape Pen Plus Kit is constructed with high quality stainless steel and is charged via an included Micro USB. The Vape Pen Plus also enhances its refilling system to provide an easier experience with an enlarged capacity. The Vape Pen Plus comes equipped with 2 large airflow inlets which provide great airflow and has a boosted battery capacity of 3000mAh. The Vape Pen Plus Kit by SMOK is the latest evolution of the SMOKtech