Pokello ea Marra e fumana khothatso ho tsoa linthong tsa tlhaho tse fumanehang tlhahong. Mehala ea morao-rao, e hloekileng ea sengoathoana ka seng e entsoe ka hloko ho bonahatsa bonolo le ho rarahana ha ka ntle. E entsoe ka boiketlo kelellong, pokello ena e ithorisa ka moralo oa morao-rao o fanang ka ts'ehetso e ke keng ea lekanngoa le ho phomola, moralo oa ergonomic o tiisa ho khutlela moo batho ba lulang teng ba ka phutholohang le ho tsosolosa ka mokhoa.