MMdex 15W Adjustable Constant Current USB Electronic Load resistor USB Current Tester Discharge Battery Test Capacity with Fan DC USB electronics loads module with adjustableconstant current output Equipped with cooling fan, it will automatically work when temperature over 40 Technical Parameter: Voltage: 3.7-13V ; Adjustable current: 0.15-3.00A ; Power: 15W (continuous working) ; Fan working temperature: 40C Fan: Ball bearing fan Portable perfect for power adapter resistor aging