DROK 180054 Load Tester Board USB 0.15-3A Adjustable Constant Industrial Grade Electronic Load Equipment Module Detector Aging Device Intelligent Discharge Resistance The USB load tester support continuous discharge power 15W and Qualcomm QC2.0 high-voltage discharge, operating voltage is 3.7V-13V. Has very stable discharge current, the adjustable constant current is 0.15-3A, adjust the screw clockwise/anticlockwise to increase/decrease the constant current. Equipped with a long life ball fan which will automatically turn on when the temperature is about 40 , suitable for long time discharge or the factory do aging test for products. Has high compatibility and the USB positive and negative pole can be led out separately, can be applied to more areas. Please note it will generate a little heat when using, please be careful and keep it away from the inflammable and explosive goods.