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The XROS 4 Nano is part of Vaporesso’s XROS-series pod devices. It’s a compact device that adds some new features compared to earlier XROS models (better screen, adjustable airflow, higher power ceiling etc.). It supports both Mouth-to-Lung (MTL) and Restricted Direct Lung (RDL) vaping styles.
Here are the main specifications of the XROS 4 Nano (from various listings in Pakistan and elsewhere) with approximate values: