Letoto lena la D40 le brushed DC motor(Dia. 40mm) le sebelisitse maemo a thata a ho sebetsa pompong e monyang ea bongaka, e nang le boleng bo lekanang ha bo bapisoa le mefuta e meng e meholo empa e boloka chelete e ngata.
Litharollo tsa rona kaofela ke motsoako oa boqapi ba rona le tšebelisano e haufi ea ho sebetsa le bareki ba rona le bafani ba thepa.
Retek e fana ka lethathamo le felletseng la litharollo tse tsoetseng pele tsa theknoloji.Baenjineri ba rona ba laetsoe ho tsepamisa boiteko ba bona ho nts'etsopele ea mefuta e fapaneng ea lienjineri tsa motlakase tse sebetsang hantle le likarolo tsa motsamao.Lisebelisoa tse ncha tsa motsamao le tsona li lula li ntlafatsoa hammoho le bareki ho netefatsa hore li lumellana hantle le lihlahisoa tsa bona.