Uhlelo Lokuhlukanisa I-Duo iyisistimu ye-modular, ekwazi ukudala uphawu lwesithombe sendawo oluthwebula ivayibhu yesimanje yamaphakathi nekhulu lama-1960. Amamojula ahlanganiswa kalula futhi ahlakazwe ngamabhande enjoloba, ngaphandle kwamathuluzi, okuvumela umsebenzisi ukuthi alungise ubuhle ngendlela athanda ngayo. Ukushintshashintsha okumnyama nokumhlophe kukhumbula ukuqanjwa kwejiyomethri kwesitayela samaphakathi nekhulu, kuyilapho ngemibala ephaphathekile kushintsha kundiza yezimvemvane. I-Duo ingahlelwa kalula njengesihlukanisi segumbi, ikhonsoli, ithebula eliseceleni, njalo idala iphethini ehlukile eshintsha ngokwesitayela ngemibala eshintshayo.