A designed according to the principle of ohm's and through the resistor in parallel through a different switch, can 3 kinds of resistance of a new USB electronic load resistance discharge, when all the switch opens, is 2.2 ohm/10W, 4.7 ohm/10W, 2 kinds of resistance in parallel at the same time, in 5V voltage can 3A discharge current.The actual current size, according to ohm's : I = RResistor in parallel calculation formula: R=1/(1/R1+1/+...+1/Rn)K1=4.7Ohm/10W , K2=2.2Ohm/10WColor: greenMaterial: PCB+ electronic componentsPackage Contents:1 x USB Resistor Electronic LoadOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.