Ukadaulo wodalirika, magwiridwe antchito okhazikika;Chipolopolo chapulasitiki cholimba kwambiri, chopepuka, chokhazikika;Single switching ntchito, ntchito yowonetsera mphamvu;Tsegulani chivundikiro chambali kuti chisamalire mosavuta;Kugwirizana ndi ergonomic ntchito, kuwala ndi omasuka, kugwira mwamphamvu kumverera, thukuta.