patented technologies, self-destruction mechanism, dedicated security processing chip, superb touch and feel JUST E4020 Series pin pad1.Dimensions(L*W*H)170*106*86mm2.Non-standard RS232 data connector with supply power(DB9 Jack)Configuration specs15-key made with waterrproof thin-membrance switcheskey's lifetime>1,000,000 cycles per keyForce on keystroke:1.2~1.8NKey's travel:1.2mmOperation ...