16 keys compact format IP65 dynamic vandal proof Stainless Steel encryption PINPAD with industrial encryption electronics controller supporting DES/TDES shielded & protected by stainless steel housing, industrial PCB with carbon-on-gold key switch technology with long stroke (2.0mm) with extremely good tactile feeling for fast and accurate data input without any noise, top stainless steel plate with threaded bolts under top stainless steel plate for top panel mounting solution.