... quality stainless steel Customizable layout, dimension and installation design Dustproof, waterproof, shake-proof, pickproof, drill-proof, bombproof ... for optional eight external function keys, beeper and guide light Two types of power supply ports Tamper protection ... dissembling is detected; Dustproof, water proof, vandalism resistance, shake-proof, pickproof; Interface:RS232, PS/2; Supply Voltage: ...