This is only the 6th Covert Cujo Larry made. Covert is an apt name as the auto firing button is disguised as a screw in the handle. Dual parallel serrated sections in the forward handle spine serve as thumb rests and, the left section slides forward or backward to enable or disable the auto function. Regardless of the auto function setting, manual opening via the thumbstuds is always available. Very smooth and very sleek.