502D waxaa loo isticmaali karaa in lagu xoojiyo 99% 5V qalabka USB. Waa mini ups toos ah. Waxay awood u siin kartaa aaladaha ay ka mid yihiin: kamaradaha, modem-yada iyo aaladaha kale ee 5V. Gudaha, uma baahnid inaad ka walwasho in kamaradu shaqayn wayday kadib koronto la'aan, taasoo keentay in la kormeero. 502D-kan wuxuu si fiican u xalliyaa dhibaatada korontadu.
