USB Load Tester, DROK Micro Battery Load Detector Board 0.15-3A 15W Adjustable Constant Current Electronic Load Resistor Age Test Device Resistance with Intelligent 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 intelligent fan which will automatically turn on when the temperature is about 40 . 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.