Semco SI HWM 788H-USB is designed for users who have more requirements on the production and charging test of the battery pack. It is modified on the basis of 788H. 788H-USB is equipped with three 5V·3A standard USB ports, 4.2V - 36V adjustable charging setting and 3A current adjustor and these are very convenient for mobile power bank or lithium battery pack producers to carry out the charging test process after building the mobile power bank.