1. Keypad made of high quality stainless steel
2. Customizable layout, dimension and installation design
3. Dustproof, waterproof, shake-proof, pickproof, drill-proof, bombproof
4. Braille key design for visually handicapped people
5. Optional USB and PS/2 connection
6. Ports for optional eight external function keys, beeper and guide light
7. Two types of power supply ports

1. Only the front panels shall be exposed to outdoor climate. The panels are dustproof, waterproof, shake-proof, pickproof, drill-proof and bombproof.
2. Operating temperature range: –25℃? 45℃
3. Storage temperature range: –25℃ - 65℃
4. Maximum humidity in operating environment: 80%

1. USB, PS/2 optional:
2. External expanding port (optional): for eight external function keys
3. Special signal output port: for external LED guide light and beeper. A 5V DC beeper and two 5V DC LED (red and green) can be supported.

1. Key lifetime > 2,000,000 cycles per key
2. Force on keys: 3~5 N
3. Key travel: 0.45mm
4. Wide voltage input: 5V DC +/- 20%
5. In running state, 5 V +/- 20% is needed; the electrical current is up to 100 mA and the actual power consumption is below 1.5W.
6. Running lifetime > 5 years; Battery lifetime > 5 years (without external power supply)