DC 3.7V-21V 35W 4A OLED USB Electronic Load Battery Tester?

Product parameters:
Operating voltage: DC3.5V-21 V (compatible with Qualcomm QC2.0 of A / B protocol 5V / 9V / 12V / 20V)
Constant discharge current: 0-3A adjustable (coarse adjustment knob to adjust the 0-3A range・ fine-tuning knob to adjust the fine tuning +/- 0.2A to achieve constant fine)
Current Operating error: no more than 2%+3mA
Continuous rated discharge power: 35W (20V・ if the high-pressure・ continuous discharge current as possible less than 1.5A・ the power to avoid overloading caused by excessive discharge FET)
Threshold of Smart Temperature Control: when the temperature・55≧・131・)・ the fan would automatically work; when・45≧(113・)・ the fan would automatically turn back off
Detector of Smart Temperature Control: premium NTC thermistor
Switching Regulator IC Frequency for Fan: 1.2MHZ
Power Indicator: Blue LED Chip
Fan speed: 4010 large fan speed 2900 / min
Control chip: constant current chip torch

Key adjust: Short press: Switch screen; press twice: Convert Chinese version of the display; press five times in a row: adjust the timing・ press six times in a row: toggle the display in English.

Discharge power tube types: Royal Philips brand・ low-impedance voltage-controlled temperature-type field effect MOS transistor (suitable for when the high temperature and pressure・ a constant current is more stable.)

Load Test Instrument (Resolution):
Voltage measuring range: 4V-21V (0.01V)
Current measurement range: 0-5A (0.01A)
Accumulated capacity range: 99999mAH (0.001Ah)
Cumulative power range: 99999mWh (0.001 Wh)
Power calculation range: 299.99W (0.001W)
Timing maximum time: 999h59m59s (1s)

Package included:
1 x USB electronic load constant current battery tester