1. Igishushanyo cyoroshye, cyerekana, LCD yerekana;
2. Gukubita no kuvanga bigerwaho mugihe cyoroshye kandi gitwara igihe;
3. Kumenyekanisha mu buryo bwikora uburyo bwo guhuza, birashobora kuba ubwenge kugirango ugere kuburyo bwihuta nuburyo bwo guhuza;
4