An USB isolator helps do away with ground loops and cuts down electromagnetic interference (EMI) amongst the computer as well as linked device. 1x GND 3V3 (P2 with 2 pins two.54mm) connector can be utilized to power externally the WCH CH569 MCU (it is usually recommended to remove the P4/SHUNT https://waylonxwyuu.gigswiki.com/5441193/how_much_you_need_to_expect_you_ll_pay_for_a_good_hydrabus