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OPOLAR offers one-year warranty against dfects. Specification: Model: F301 Speed Mode: Low / Medium / High. Note: no airflow difference between 2 and 3 settings when plugged in for protecting power sourceOutput Power(MAX): 4.5W Battery Working Time (H): 2(High) - 4(Medium) - 7(Low) Battery Specification: 2200mAh Lithium Battery(included)Battery Installation: Unremovable Dimension(inch): 3.94*1.6*5.9 N.W.(lb)(including battery): About 0.5 Notice: no power adapter is included due to cost and customer can use phone adapter to charge it.