1, IC chip dijitaal ah, oo diyaar u ah 99% Taleefan casri ah oo nooca C ah. 2, Naqshad asal ah oo badh dhegta ah, jilicsan oo raaxo leh in la xidho oo la isticmaalo. 3, Af-hayeenka giraanta naxaasta ah iyo diaphragm badan oo loogu talagalay codka saafiga ah. 4,Xakamaynta fog, garaac/dami, heesta ugu dambeysa iyo tan xigta, mugga kor/hoos u dhig, ku habboon in la hagaajiyo.