USB Adjustable Constant Current Electronic Load Battery Capacity Tester Module 185W 20A Features: LCD screen, display information comprehensively and clearly. Configuration of intelligent fan, which can dissipate the heat effectively and quietly. Test various batteries, direct current power supply, and charging data lines. Specification: Current measurement range: 0.00A ~ 20A, Resolution accuracy: 0.05A Capacity accumulation range: 0 ~ 999.999Ah, Resolution accuracy: 0.01Ah Power accumulation range: 0 ~ 9999.9Wh, Resolution accuracy: 0.01Wh Power measurement range: 0000.00 ~ 2999.99W, Resolution accuracy: 0.01W Impedance measurement range: 1 ~ 999.9Ω, Resolution accuracy: 0.01 Ω Temperature measurement range: 0 ~ 99 ℃, Resolution accuracy: 1 ℃ Timing maximum time: 999 hours 59 minutes 59 seconds, Resolution accuracy: 1 second Timing measurement reminder settings: countdown 24 hours, any value can be set Small current standby to remind the threshold parameters and timing: <2W / 0.5 hours; > 0.5W begin timing Refresh time: > 500mS / times Measurement rate: about 2 times / sec Overflow Reminder Set Range: 0.2 ~ 100A Display Type: Micro power LCD Module LCM Green Backlight Chinese & English Display Operating temperature:  -10 ~ +60 ℃ Interface: USB, 5.5mm jack, Mini USB, Micro USB, Type-C Working humidity: 10 ~ 80 Working pressure: 80 ~ 106kPa Size: Approx. 156 x 96 x 58mm / 6.1 x 3.7 x 2.2inch Weight: 631g Note: 1. Please turn down the knob to the end counterclockwise before using, and then turn up slowly. 3. Several tested power supply can not be connected simultaneously. 4. The current adjustment knob should be regulated slowly. Package Include: 1 x Fan 1 x USB Cable 2 x Crocodile Clip1 x Manual (Other items in the picture are NOT included)