Description: _x000D_ This is a device used to simulate an electrical load, usually for testing purposes. This discharge tester is used for testing a battery or power bank. It can also be used to test current of a USB cable so you could judge if the cable is of good quality. It is designed with a aluminum heat sink and a cooling fan for better heat dissipation, which will start working automatically when temperature is higher than 55C and stops when temperature is under 45. _x000D_ _x000D_ _x000D_ Features: _x000D_ There are 2 adjustment knobs, one coarse knob and one fine knob, that can be used for quick and accurate current control._x000D_ _x000D_ The input USB port is reversible for easy plug in which mean that you don't have to worry about up or down position of it._x000D_ _x000D_ Designed with a high standard aluminum heat sink in the middle for better heat dissipation. _x000D_ The cooling fan of 2900rpm will start working when temperature is higher than 55C and stops when temperature is under 45. _x000D_ These is a small LCD display that you can check voltage, current and capacity._x000D_ _x000D_ _x000D_ _x000D_ Specifications: _x000D_ Voltage Range: 4-30V DC _x000D_ Test Current: 0.1-4.5A_x000D_ _x000D_ Operation Temperature: -10 to 65C_x000D_ _x000D_ Size: 105 x 55 x 43mm / 4.13 x 2.16 x 1.69" _x000D_ Heat Sink Size: 40 x 40 x 10mm / 1.57 x 1.57 x 0.39" _x000D_ Constant Discharge Current: 0.1-4.5A adjustable(coarse adjustment knob for 0-3A, fine adjustment knob for +/-0.2A) _x000D_ Current Error: Less than 2%+3mA _x000D_ Constant Rated Discharge Rate: 35W(if voltage is 21V, constant discharge current should be less than 1.6A) _x000D_ _x000D_ _x000D_ Package Includes: _x000D_ 1 x Load