Nyob hauv tus qauv ntawm ob lub pwm, nws yog qhov tsim nyog yuav tsum tau ua tib zoo saib mus rau qhov chaw ntawm qhov nplaum qhov nplaum, thiab nws yog ib qho tsim nyog yuav tau ua kom paub tseeb tias cov nplaum muaj qhov nraub qaum ntawm qhov chaw pov thaiv kom tsis txhob deformation ntawm cov kua nplaum.
Dual colour pwm yog nce nrov nyob rau hauv kev ua lag luam, uas yuav ua rau cov tsos ntawm cov khoom zoo nkauj dua, yooj yim los hloov xim thiab tsis tuaj yeem txau, tab sis tus nqi kim kim thiab qhov kev xav tau siab.