Gadgetry is small machines or devices which do something useful.
例句
In the days before domestic gadgetry and time-saving appliances, food preparation took up most of the day.还没有家用小器具和省时的家用电器的时候,准备食物得花大半天时间。...a passion for the latest electronic gadgetry.对时新电子小玩意的痴迷