Metal Shrapnel Switch (karye Dome) - zabar shrapnel matsayin key lamba surface daga cikin manya kewaye.
Abũbuwan amfãni: a) Good hannunka ji, uniform karfi. b) A mainpulator iya ji da hujjõji sauti a lokacin da aiki da shi; c) Yana iya har yanzu a yi amfani ga al'ada ko da a babban temperature.environment.